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Astronomy Final
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Preguntas del test (93)
1Which of the following layers of a planet is not characterized by its density?
- Acore
- Bmantle
- Clithosphere
- Dcrust
- Enone of these
2As a planet cools, what happens to its lithosphere?
- AIt gets thicker
- BIt rises to the surface of the planet
- CIt gets thinner
- DNothing, except getting colder, too.
- EIt sinks to the center of the planet
3Which of the following does not transport heat out of a planet's interior?
- Anone of these (all are processes that transport heat out of a planet's interior)
- Bconduction
- Cdifferentiation
- Dconvection
4Where in Earth is conduction the most important heat transport process?
- Ain the crust
- Bin the mantle
- Cin the lithosphere
- Din the core
5What role does a planet's size play in its geological activity?
- ALarger planets are less geologically active because there is a greater distance between the core and the surface
- BLarger planets are less geographically active because they have larger surface areas to radiate heat away.
- CLarger planets are more geologically active because they have thicker lithospheres
- DLarger planets are less geologically active because they have thicker lithospheres.
- ELarger planets are more geologically active because they take longer to cool off.
6Which of the following is not needed for a planet to have a global magnetic field?
- Amoderately rapid rotation
- Ban electrically conducting fluid in the interior
- Ca thick electrically conducting lithosphere
- Dconvection in the conducting fluid
7Which planetary properties control erosion?
- Adistance from the Sun
- Bsize
- Crotation rate
- Dall of these
8Which of the following geological processes is most evident on the surface of a small planet?
- Asize does not affect the geological processes
- Berosion
- Ctectonics
- Dimpact cratering
- Evolcanism
9The geological age of a planet's surface can be determined by the amount of
- Aimpact craters
- Btectonic features
- Cvolcanic features
- Derosion features
10Why are the lunar maria smooth?
- AThey formed after the heavy bombardment and therefore have fewer craters
- BThe lava that formed the maria lacked gases and was therefore thin and runny
- CBombardment of the Moon by meteoroids smoothed over any original rough features in the maria
- DThe maria are liquid
- EThey formed after the heavy bombardment, therefore have fewer craters and the lava that formed the maria lacked gases and was therefore thin and runny
11Why does Mercury have large cliffs?
- AThey were produced by the stress of a large upwelling on one side of the planet that produced a bulge with canyons and cliffs
- BThe cliffs are rims of large impact basins
- CThey were produced when the interior cooled and the entire planet shrank
- DThey were produced by plate tectonics, much life cliffs on Earth
12Who popularized the idea that there was a network of canals on Mars which carried water from the polar ice caps?
- AHG Wells
- BOrson Wells
- CGiovanni Schiaparelli
- DPercival Lowell
- EWilliam Herschel
13Which of the following is not a similarity between Mars and Earth today?
- AThey have similar axis tilts
- BThey both have polar ice caps
- CThey both have rivers
- DThey have similar amounts of land
- EThe lengths of their days are similar
14Which of the following geologic processes is currently active on Mars?
- Avolcanism
- Bimpact cratering
- Ctectonics
- Dall of these
- Enone of these
15Which of the following is not evidence that has been found for liquid water on Mars' surface in the past?
- Athe presence of iron-bearing spheres called "blueberries" that form in water
- Bancient riverbeds
- Clayered deposits similar to sedimentary rocks
- Dall of these (none are evidence of past water)
- Enone of these (all are evidence of past water)
16The distribution of craters on the surface of Venus suggests that
- Ait's surface is ancient and has not been altered by volcanism, erosion or tectonics since the time of the heavy bombardment
- Bparts of the surface are ancient, while others have been resurfaced within the last 100 million years
- Cthe entire planet was resurfaced about 750 million years ago
- Dthere has been ongoing regional resurfacing leading to a distribution of surface ages between about 100 million years and 750 million years
17Why doesn't Venus have plate tectonics?
- AIt has a thick lithosphere because it has lost any water originally present in the crust and mantle
- BIt lacks strong mantle convection because it rotates slowly
- CIt lacks strong mantle convection because its interior has cooled
- DIt has a thick lithosphere because its interior has cooled
18Which of the following is not evidence of plate tectonics on Earth?
- AThere are fossils of similar species on widely separated continents.
- BSeafloor crust is much younger than continental crust.
- CMid-ocean ridges are sites of mantle material eruption and seafloor spreading.
- DTidal forces from the Moon and Sun are strong enough to cause continental drift.
- Enone of these (all are evidence of plate tectonics)
19Plumes of hot mantle material are responsible for
- Athe formation of the Hawaiian Islands
- Bthe geysers of Yellowstone National Park
- Cthe Appalachian Mountains
- Dall of the above
- Eboth the formations of the Hawaiian Islands and the geysers of Yellowstone National Park
20Why does Earth have the youngest surface of all the terrestrial planets today?
- AIt is the largest terrestrial planet so its interior has not cooled too much
- BIt is not so close to the Sun that it has lost its water and developed a thick lithosphere
- CIt rotates rapidly
- Dall of these
- EIt rotates rapidly and it is not so close to the Sun that it has lost its water and developed a thick lithosphere
21Which lists planets in order of increasing atmospheric surface pressure?
- AMars, Venus, Earth
- BMars, Earth, Venus
- CEarth, Venus, Mars
- DEarth, Mars, Venus
- Enone of these
22Why does atmospheric pressure decrease with altitude?
- AThe molecules in the upper atmosphere are lighter.
- BThe weight of the atmosphere above decreases as altitude increases.
- CThe temperature of the atmosphere increases.
- DThe temperature of the atmosphere decreases.
23How does the greenhouse effect work?
- AGreenhouse gases absorb light that reflects off the surface.
- BGreenhouse gases reflect thermal radiation that is emitted by the surface.
- CGreenhouse gases reflect light that reflects off the surface back toward the surface.
- DGreenhouse gases absorb thermal radiation that is emitted by the surface.
24Which of the following is not a greenhouse gas?
- Awater vapor (H20)
- Bozone (03)
- Ccarbon dioxide (CO2)
- Dmethane (CH4)
25What heats the stratosphere?
- Aultraviolet light
- Bx-rays
- Cthermal radiation (infrared light)
- Dconvection from the troposphere
- Eultraviolet light and x-rays
26Why is the sky blue?
- AAir molecules absorb all wavelengths of light and emit blue light.
- BAir molecules absorb red light and reflect blue light.
- CThe atmosphere is reflecting the blue-color of the oceans.
- DAir molecules scatter blue light more than they scatter red light.
27How does the Coriollis effect affect the circulation of a hurricane (low pressure system) in the northern hemisphere?
- AThe Coriollis effect has no effect on the circulation of a hurricane.
- BIt causes inflowing air to deviate to the left, resulting in clockwise rotation.
- CIt causes inflowing air to deviate to the right, resulting in clockwise rotation.
- DIt causes inflowing air to deviate to the right, resulting in counterclockwise rotation.
- EIt causes inflowing air to deviate to the left, resulting in counterclockwise rotation.
28Which of the following is not a factor in producing long-term climate change?
- AThe axis tilts of planets slowly change.
- BThe distances of the planets from the Sun slowly change.
- CThe abundance of greenhouse gas in the atmosphere changes.
- DThe reflectivity of a planet may change.
- EThe brightness of the Sun slowly changes.
29What is the primary source of gas for thick terrestrial planet atmosphere?
- Ameteoroid impacts on the surface
- Bvolcanic outgassing
- Cimpacts on the surface by the solar wind
- Devaporation and sublimation from the surface ices and liquids
30Which of the following increases atmospheric loss by thermal escape?
- Aincreasing mass of the gas particles
- Bincreasing the temperature of the atmosphere
- Cincreasing the escape velocity of the planet
- Dall of these
31What is the source of the exospheres of the Moon and Mercury?
- Aevaporation and sublimation from the surface ices and liquids
- Bimpacts on the surface by solar wind particles
- Cmeteoroids impacts on the surface
- Dvolcanic outgassing
- Eimpacts on the surface by solar wind particles and meteoroids impacts on the surface
32How do seasons on Mars differ from seasons on Earth?
- AThey are less extreme because of Mars' larger orbit.
- BThey are less extreme because of Mars' smaller axis tilt.
- CThey are more extreme because of Mars' greater axis tilt.
- DSeasons on Mars and Earth are about the same.
- EThey are more extreme because of Mars' larger orbital eccentricity.
33If all the ice in Mars' polar caps were melted, how deep an ocean would it make?
- Aabout 10m
- Babout 100m
- Cabout 1m
- Dabout 10cm
- Eabout 1cm
34How does a magnetosphere affect a terrestrial planet atmosphere?
- AIt protects the upper atmosphere from the solar wind.
- BIt protects the upper atmosphere from x-rays.
- CIt redistributes energy from the poles to the equator.
- Dall of these
- EIt has no effect on the atmosphere.
35Why did Mars lose most of its atmosphere?
- AIt's atmosphere condensed onto the poles and froze into the soil because Mars is farther of the Sun
- BIt lost its atmosphere to space after losing its magnetic field.
- CIts small size prevented it from holding on to its atmosphere.
- DIts interior cooled so volcanic outgassing stopped.
- Eall of these
36What is the primary constituent of Venus' atmosphere?
- Acarbon monoxide (CO)
- Bwater (H2O)
- Ccarbon dioxide (CO2)
- Doxygen (O2)
- Enitrogen (N2)
37Which of the following did not contribute to Venus' runaway greenhouse effect?
- AWater evaporates leading to higher temperatures and more evaporation.
- BDue to its slow rotation, its magnetic field failed to prevent heating of the atmosphere by the solar wind.
- CVenus is closer to the Sun leading to higher temperatures.
- DHigh temperatures and the absence of water caused carbon dioxide to outgas from rocks and enter the atmosphere, leading to higher temperatures.
38Where is most of Earth's carbon dioxide?
- Ain the oceans
- Bin rocks
- Cin the rainforests
- Din the atmosphere
39What happens to CO2 in the Earth's atmosphere during "snowball Earth" periods.
- AThe amount of CO2 increases because of the large amount of CO2 present in the global ice sheets.
- BThe amount of CO2 increases because outgassed CO2 can not be dissolved in the frozen oceans.
- CThe amount of CO2 decreases the cold temperatures cause CO2 to condense out into the ice.
- DThe amount of CO2 decreases because there is less volcanic activity during the cold "snowball Earth" periods.
40How does the current level of atmosphere CO2 compare to historic levels?
- AIt is 30% higher than it has been anytime in the last 100 years.
- BIt is 30% higher than it has been anytime in the last million years.
- CIt is 30% higher than it has been anytime in the last 10,000 years.
- DIt is 30% higher than it has been anytime in the last 4 billion years.
41How do computer models demonstrate that human activity is affecting the global climate?
- AModels that include increases in greenhouse gas due to human activity match observed changes in Arctic sea ice.
- BModels of CO2 production by burning of fossil fuels match observed changes in CO2 dissolved in the ocean.
- CModels that include increases in greenhouse gases due to human activity match observed global temperature changes.
- DModels of CO2 production by burning of fossil fuels match the observed increases of atmospheric CO2.
42How does the composition of Uranus and Neptune compare to the composition of Jupiter and Saturn?
- AUranus and Neptune are mostly hydrogen compounds while Jupiter and Saturn are mostly hydrogen and helium
- BUranus and Neptune are mostly rocky while Jupiter and Saturn are mostly hydrogen and helium
- CUranus and Neptune are mostly hydrogen and helium while Jupiter and Saturn are mostly hydrogen compounds.
- DUranus and Neptune have compositions very similar to Jupiter and Saturn
- EUranus and Neptune are mostly hydrogen compounds while Jupiter and Saturn are mostly rocky
43How are the Jovian planets affected by their rotation?
- ATheir rapid rotation causes the lighter elements hydrogen and helium to fling out to their outer layers and denser hydrogen compounds to settle in their cores.
- BTheir rapid rotation causes the planets to be slightly flattened, larger across the equator than pole to pole.
- CTheir rapid rotation causes a build up of hydrogen and helium near the equator nd hydrogen compounds near the cores.
- DTheir rapid rotation causes the planets to be stretched, larger pole to pole than across the equator.
- ENone of these
44The core of Jupiter is
- Aabout the same size as Earth
- Babout the same mass as Earth
- Cabout the same composition as Earth
- Dabout the same size and mass of Earth
- Eall of these
45The interior of which Jovian planet is heated by helium rain?
- AAll of these
- BSaturn
- CJupiter
- DUranus
- ENeptune
46Why are methane clouds not seen on Jupiter or Saturn?
- AAt our viewing angle, the methane clouds on Jupiter and Saturn are transparent.
- BJupiter and Saturn do not have enough methane to make clouds.
- CJupiter and Saturn are rotating too quickly for their methane clouds to be visible to us.
- DMethane clouds are seen on Jupiter and Saturn.
- EJupiter and Saturn have sulfur compounds that combine with all their methane to make reddish methane-sulfide clouds.
- FBecause of their relatively warmer temperatures, Jupiter and Saturn have clouds of water that obscure our view of their methane clouds.
- GThe atmospheres of Jupiter and Saturn are too warm for methane clouds to form.
47What causes the white bands we see on Jupiter?
- Aformation of ammonia clouds in regions of rising air
- Bformation of water clouds in regions of rising air
- Csnow on mountain peaks
- Dgaps in ammonium hydrosulfide clouds revealing ammonia clouds below
- Egaps in ammonium hydrosulfide clouds revealing water clouds below
48Which of the Jovian planet has no seasons?
- ASaturn
- BNeptune
- CJupiter
- DAll of the Jovian Planets have seasons
- EUranus
49Where is Neptune's magnetic field generated?
- Ain a liquid metallic core
- Bin an ocean of hydrogen and helium
- Cin an ocean of hydrogen compounds, rocks, and metals
- Din a layer of metallic hydrogen
50Which planet has the most large moons?
- ANeptune
- BUranus
- CSaturn
- DJupiter
51Tidal heating on Io causes
- Ageysers of water at its south pole
- Btectonic surface features
- Ca subsurface water ocean
- Dsulfur volcanoes
52Io, Europa, and Ganymede have tidal heating because
- Athey are the closest moons to Jupiter
- Bthey are the largest moons in the solar system
- Can orbital resonance keeps their orbits elliptical
- Dan orbital resonance causes the moons to exert tidal forces on each other
53What is the largest moon in the solar system?
- AEuropa
- BTriton
- CIo
- DGanymede
- ETitan
54What is the liquid in Titan's rivers and lakes?
- Asulfur
- Bwater
- Cmethane and ethane
- Dsulfur and ammonia
55What is unusual about Tritan?
- AIt has a backwards orbit.
- BIt has a large axis tilt.
- CIt has volcanic activity.
- DIt has rivers and lakes.
56Why are some small Jovian planet moons geologically active?
- Aall of these
- BThey have large amounts of radioactive materials
- CIce is able to deform at lower temperatures than rock
- DImpact cratering melted the interior
57What causes waves in Saturn's rings?
- Aimpacts into the rings
- Bvariations in the composition of the ring particles
- Cimpacts from charged particles in the magnetosphere
- Deruptions from nearby moons
- Eorbital resonances from nearby moons
58Which of the following is not a similarity between all Jovian planet ring systems?
- AThey are all on nearly circular orbits
- BThey are all made of bright, icy particles
- CThey all have features shaped by moons and resonances
- DThey are all on nearly equatorial orbits
59Why don't ring particles form a moon?
- AThey collide too violently to accrete into a moon
- BTheir masses are too small for them to accrete
- CThey collide too infrequently to make a moon
- DTidal forces from the planet they orbit prevent them from accreting
- ETidal forces from moons prevent them from accreting
60How big is the largest asteroid?
- Aabout 3000 km in diameter
- Babout 300 km in diameter
- Cabout 1000 km in diameter
- Dabout 100 km in diameter
61What is the average distance between asteroids in the asteroid belt?
- Aabout 10,000 km
- Babout 100 km
- Cabout 100,000 km
- Dabout 1,000 km
- Eabout 1,000,000 km
62Why didn't the material in the asteroid belt form a planet?
- AOrbital resonances with Jupiter disrupted the orbits of the asteroids and prevented them from forming a planet.
- BA planet formed early in the solar system and was broken apart by a huge impact.
- CThe asteroids were too far apart to run into each other frequently enough to form a planet.
- DTidal forces from Jupiter prevented the asteroids from accreting into a planet.
- EThere was not enough material there to gravitationally accrete into a planet.
63What are the Trojan asteroids?
- AThey are asteroids in the 1:1 resonance with Jupiter in Jupiter's orbit.
- BThey are hollow asteroids.
- CThey are asteroids in any resonance with Jupiter.
- DThey are asteroids whose orbits cross the orbits of Earth and Mars.
- EThey ae particularly large asteroids in the main asteroid belt.
64Why are most meteorites found in Antarctica?
- AMeteorites are dark and easy to spot against the ice in Antarctica.
- BBecause of the slower rotational speed of Earth at the poles, meteorites are more likely to survive atmospheric entry near the poles.
- CThe orbits of meteoroids and the title of Earth's axis make them more likely to impact near the poles.
- DPenguins confuse meteorites with their eggs and rescue them, making them easy to collect from Antarctica.
- EMeteorites melt coming through the atmosphere and usually only survive if quickly refrozen by the cold temperatures of Antarctica.
65What are the most common types of meteorites?
- Ametal-rich processed meteorites
- Bstony primitive meteorites
- Ccarbon-rich primitive meteorites
- Drocky processed meteorites
- Emeteorites from the Moon and Mars
66What is the orientation of a comet's plasma tail?
- AThe plasma tail "wags" between various different orientations behind the direction of the comets motion.
- BThe plasma tail extends from the nucleus in the opposite direction of the Sun.
- CThe plasma tail extends from the nucleus toward the Sun.
- DThe plasma tail extends from the nucleus both away from the Sun and away from the orbital motion of the comet.
- EThe plasma tail extends from the nucleus in the opposite direction of the comet's motion.
67What produces meteor showers?
- AMeteor showers are cause by the passage of Earth through the dust tail of a comet.
- BMeteor showers are caused by the passage of Earth through the debris cloud of an asteroid collision.
- CMeteor showers are caused by the passage of Earth through the debris left by a comet in its orbit.
- DMeteor showers are produced by a large meteoroid breaking up as it enters the atmosphere.
68Comets are often described as
- A"giant snowballs"
- B"icy impactors"
- C"icy asteroids"
- D"dirty ice cubes"
- E"dirty snowballs"
69Where do the Kuiper belt comets come from?
- AThey formed in the Kuiper belt.
- BThey formed among the Jovian planets and were pushed out by the solar wind.
- CThey formed in the asteroid belt and were scattered out by Jupiter.
- DThey formed around another star and were captured by the Sun when it passed near the star.
- EThey formed among the Jovian planets and were scattered out by Jupiter.
70How is Pluto different from the other objects in the Kuiper belt?
- AIt has moons, unlike other Kuiper belt objects
- BIt is the only Kuiper belt object in resonance with Neptune
- Cnone of these
- DIts orbit is unlike that of any other Kuiper belt object
- EIt is larger than all of the Kuiper belt objects
71How many moons have been discovered around Pluto?
- A5
- B3
- C2
- D4
- E1
72What is a dwarf planet?
- AA dwarf planet is any object orbiting the Sun that is not one of the 4 Jovian planets
- BA dwarf planet is any object orbiting the Sun that is not one of the 9 planets
- CA dwarf planet is any object orbiting the Sun that is large enough to be round but not one of the 4 Jovian planets
- DA dwarf planet is any object orbiting the Sun that is not one of the 8 planets
- EA dwarf planet is any object orbiting the Sun that is large enough to be round, but not one of the 8 planets.
73What is the largest dwarf planet discovered to date?
- AEris
- BTriton
- CPluto
- DCeres
- ESedna
74What is Comet SL9?
- AIt is the comet that was studied by the Deep Impact spacecraft, which sent an impactor into its nucleus
- BIt is a comet that was seen crashing into Jupiter
- CIt is the largest comet in the Oort cloud
- DIt is the comet that hit Earth 65 million years ago leading to a mass extinction.
75Which of the following is not evidence for a large impact on Earth 65 million years ago?
- Aenhanced levels of elements common to meteorites in 65 million-year-old sediment layers
- Btraces of a crater scar underground
- Csolidified rock droplets in the sediment layers
- Dsoot in sediment layers indicating global fires
- Eglobally distributed meteorites with a radiometric age of 65 million years
76How large was the object that caused the Tunguska impact?
- Aabout 1 km across
- Babout 100 m across
- Cabout 40 m across
- Dabout 400 m across
- Eabout 4 km across
77How often does an impactor large enough to cause tsunamis and widespread devastation strike Earth?
- Aabout once in a million years
- Babout once in a billion years
- Cabout once every 1000 years
- Dabout once in a hundred million years
78How would the impact history on Earth have been different if Jupiter didn't exist?
- AThere would be more impacts from asteroids and fewer from comets
- BThere would be more impacts from comets and asteroids
- CThere would be more impacts from comets and fewer from asteroids
- DThere would be no significant differences
- EThere would be few impacts from comets and asteroids
79Seeing a planet around another start is difficult in part because the reflected light from a planet is at least _______ than the star.
- Aone million times fainter
- Bone hundred thousand times fainter
- Cone hundred million times fainter
- Done billion times fainter
- Eone thousand times fainter
80Which of the following techniques has been used to find the most extrasolar planets so far?
- Athe Doppler technique
- Bthe astrometric technique
- Ctransits and eclipses
- Ddirect detection
81Which of the following can not be determined with the Doppler technique?
- Athe size of the planet
- Bthe mass of the planet
- Cthe orbital period of the planet
- Dthe size of the planet's orbit
82What is the astrometric technique for discovering extrasolar planets?
- AIt is the observation of changes in the position of the star due to the gravitational effects of an orbiting planet
- BIt is the observation of changes in the star's brightness as a planet passes in front of the star
- CIt is the observation of changes in the star's spectrum due to the gravitational effects of an orbiting planet
- DIt is the observation of changes in the star's spectrum due to the presence of the spectral signature of the planet in the same observation
83What is the difference between a transit and an eclipse?
- AAn eclipse is when a planet passes in front of the star and a transit is when it passes behind the star
- BA transit is when a star's position changes due to a planet, and an eclipse is when a star's brightness changes due to a planet
- CA transit is when the planet passes in front of the star and an eclipse is when is passes behind the star
- DThere is no difference. These are two terms referring to the same event
84Which technique of extrasolar planet detection can tell us about the composition of a planet's atmosphere?
- Adirect detection
- Btransits and eclipses
- Cthe Doppler technique
- Dall of these
- Edirect detection, transits, and eclipses
85Which technique of extrasolar planet detection can tell us about the orbital period of a planet?
- Adirect detection
- Btransits and eclipses
- Cthe Doppler technique
- Dastrometry
- Eall of these
86What are the orbits of most extrasolar planets like?
- AThey are more eccentric than the orbits of Mars
- BThey are nearly circular
- CThey are larger than the orbit of Jupiter
- DThey are more inclined than the orbit of Pluto
87What is the biggest surprise about extrasolar planetary systems?
- AMost of the systems only have one planet
- BMany systems have several planets larger than Jupiter
- CMany systems have very large planets orbiting close to the star
- DMost of the planets do not fit into categories of terrestrial or Jovian planets
88What is a hot Jupiter?
- Aa gas giant with a large orbital eccentricity
- Ba gas giant with large amounts of radioactive material
- Ca gas giant with a larger than usual source of internal energy
- Da gas giant whose atmosphere is heated to high temperatures due to its small distance from its star
- Ea gas giant that has an extremely high interior temperature
89How can we explain the presence of gas giants so close to their stars?
- AThe hot Jupiters are close to cool stars, and so are not actually very hot and have the same history as gas giants in our own solar system.
- BThese gas giants formed from a star, and were captured by another star in a much closer orbit
- CThese gas giants formed far from the star and migrated inward due to the effects of waves in nebula
- DThese gas giants formed far from the star and migrated inward due to gas drag in the nebula
- EThe nebular theory has been modified to allow for the formation of gas giant planets close to a star
90Why do many extrasolar planets have larger orbital eccentricities?
- ATheir eccentricities are increased by close gravitational encounters with other planets while they migrate
- BTheir eccentricities are increased by orbital resonances with other planets
- CThe effect of waves in the nebula on the planet increases the planet's eccentricity
- Dall of these
- ETheir eccentricities are increased by close gravitational encounters with other planets while they migrate and their eccentricities are increased by orbital resonances with other planets
91Why are most extrasolar planetary systems so different than ours?
- AOur planetary system has been affected to an unusual degree by giant impacts, causing it to be different than the extrasolar planetary systems that we now see are more typical.
- BIt is easier to detect planets that are massive and close to their stars, and harder to detect systems like our own
- CThe Sun's nebula was affected by a nearby supernova making it the exception, rather than the rule
- DThere is a large diversity of planetary systems predicted by the nebular theory, and we would not expect any two to be similar
92How will the Kepler mission search for Earth-like planets?
- AIt will measure the spectra of extrasolar planets to look for the signature of nitrogen-oxygen atmospheres
- BIt will search for the dip in a star's brightness when an Earth-like planet transits (passes in front of) the star
- CIt will search for the perturbations in the star's motion caused by Earth-like planets using the Doppler technique
- DIt will measure the perturbations in a star's brightness caused by gravitational microlensing from Earth-like planets.
93How will astrometry be improved to allow detection of extrasolar planets with future telescopes?
- Aby placing a large telescope on the surface of the Moon
- Bby using radio telescopes positioned around the world to create a telescope with an effective size as large as the planet
- Cby using a very large space-based telescope with a deployable reflective mirror
- Dby using interferometry (combining the signals of two or more space telescopes) to obtain better angular resolution
Información
- Descripción
- Test sobre Astronomy Final, creado por Meredith Molseed el 29/07/2021.
- Autor
- Meredith Molseed
- Idioma
- English
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