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Final Exam Review
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- 1Cosmic Microwave Background RadiationThermal radiation left over from the Big Bang (oldest light in the universe)
- 2Basic Stages of Sun's Life1. Gas Cloud (Nebula)
2. Protostar
3. Hydrogen Fusion begins
4. Main Sequence star - 3Astronomical Unit (AU)Distance from Earth to the Sun is 149 million kilometers
- 4Light YearDistance time takes to travel one year in a vacuum
- 5ParsecAmount that a star moves as earth goes from one side of the sun to the other
=3.26 LY - 6Hubble's LawV=H0 * D
Velocity = Hubble's Constant * Distance - 7Interstellar MediumGas and dust that lies between stars
- 8What happens when you triple the distance from a light source?Brightness decreases 1/9
- 9What fuel Quasars?Gas/dust they accrete
- 10Where does a star spend most of its life?Main Sequence
- 11What does it mean if a galaxy is 1 billion light years away?1. We are seeing the galaxy as it was 1 billion years ago
2. 306 Mpc away from us - 12What is the scale of star types?OBAFGKM
- 13Which star type is the hottest?O stars are hot, blue, and young
- 14Which stars are the coolest?M stars are cool, red, and old.
- 15What color are F stars?F stars are yellow-white
- 16Dark MatterMakes up 90 percent of universe
- 17AGN ExamplesQuasars, Radio Galaxies, BL Lacerta Objects, and Seyfert Galaxies
- 18How do we measure the mass of a star?1. Luminosity
2. Temperature
3. Orbital speeds in binary systems - 19How is the velocity of recession measured?Hubble's Law
- 20How large is the Quasar's active region?The size of a solar system
- 21Where do White Dwarfs get their energy?No energy, electron degeneracy pressure prevents collapsing of white dwarf
- 22What type of universe do we live in?Expanding Universe
- 23Neutron StarsCompact, no active fusion in cores and are a result of supernova
- 24What does Hubble's Constant reveal?The rate of expansion in a universe
- 25What property of a star during its final stages determines what type of object the star will become?The star's mass
- 26Unbound UniverseA universe having less than critical density
- 27Collisions between galaxies produce what?Collisions between galaxies heat and eject intracluster matter, forming new galaxies
- 28Cosmological RedshiftShift of the wavelength of received light from distance objects, indicates motion away from us
- 29Are galaxies spaced evenly in space?No, galaxies are not evenly distributed (they occur in clusters and superclusters)
- 30Why does the Milky Way have more stars than other galaxies?Conservation of Angular momentum creates higher concentration of stars
- 31Effect of large amounts of dark matter?Could cause universal collapse if sufficient amount of density
- 32Evidence that sun is a ball of gas1. Differential rotation
2. Limb Darkening
3. Sunspots - 33Blue ShiftStar is moving towards us
- 34Active Galactic NucleusRegion within the center of a galaxy that has abnormally high luminosity across the EM Spectrum
- 35PulsarPulsing radio source that is centered on the collapsed core of a high mass star
- 36H-Alpha line lengthens when hydrogen atoms move away from us due toRedshifting
- 37G0 Star Surface Temperature5250K-5950K
- 38CosmologyScience of the origin and development of universe
- 39Measurement of Star's colors tell usMass and temperature
- 40Black HoleNo volume, infinite density, and not supported by anything
- 41Bound UniverseUniverse having more than critical density
- 42Where are atoms in our universe formed byStars
- 43Why is our sun not fusing hydrogen anymore?Core temperature needs to reach a much higher temperature
- 44What kind of stars are in an elliptical Galaxy?Red, cool, old stars (found within halo and bulge)
- 45How was most of the helium made in the Universe?During the Big Bang
- 46Planetary NebulaNebula consisting of ionized gas that has been ejected from old red giant stars late in life
- 47Around which stars is life most likely to emergeStars similar mass to the sun (either F or G star)
- 48Where does stellar luminosity come from?Size and temperature
- 49Cosmological PrincipalDistribution of matter in the universe is homogeneous
- 50IsotropyUniformity in all orientations (no preferred direction within the universe)
- 51HomogeneityHaving the same properties at every point (universe is the same everywhere)
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- Fichas sobre Final Exam Review, creado por adamchik el 05/05/2016.
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