Flashcards
astronomy review
Cards in this deck (57)
- 1Astronomy is the study of...matter and energy in outer space
- 2The universe is all matterall matter and infinite
- 310 trillion km is equal to1 light year
- 4Smaller distances in space are measured in what?astronomical units (AU)
- 5What is another name for a burning ball of hot gas?star
- 6A group of stars all held together by a gravitational pull is what?a galaxy
- 7what is a pattern of stars called?constellation
- 8What orbits a starplanets
- 9Stars, Planets, Moons, Asteroids and comets, Nebulae, Star clusters, Galaxies, Pulsars, Quasars, Black holes and Dark matter are all what?celestial objects
- 10Light can be used for what?determining the composition of a star, determining the temperature of a star, determining the age of a star
- 11What do we use to find out what types of elements are in a star?absorption spectra
- 12What is it called when the planets orbit the sun once?one revolution
- 13how long does it take for earth to do one revolution around the sun?365.25 days
- 14what angle is the earth tilted on the axis?23.5 degrees
- 15When the northern hemisphere is close to the sun it is warmer we call this...summer
- 16when the northern hemisphere is farther away from the sun it is colder we call this...winter
- 17The .25 in the 365.25 days is turned into what?an extra day (called a leap year)
- 18a giant ball of dust and gas is called a...nebula
- 19a forming star is called a...protostar
- 20High temperatures and high pressures in the center of the nebula cause what?nuclear fusion
- 21when 2 nuclei collide at extremely fast speeds to overcome repulsion this is callednuclear fusion
- 22once fusion stops and the hydrogen in the sun runs out what will happen?the temperature of the sun will increase to fuse helium, and the outer layer will puff out and form a red giant
- 23After nuclear fusion how long does a star stay a main sequence star?90% of it's life
- 24how long to small stars last?100 billion years
- 25how long to medium stars last?10 billion years
- 26how long do large stars last?a few million years
- 27how long to huge stars last?1 million years
- 28When the core fuel runs out again and the star explodes what does it create?a planetary nebula
- 29When a huge star explodes it is called a...supernova
- 30what is left over when a small or medium star explodes?a white dwarf
- 31what is left over when a large star explodes?neutron star
- 32what is left over when a huge star explodes?a black hole
- 33How can you tell how hot a star is?If it is blue, purple, indigo or green it is super hot. If it is yellow, orange or red it is not that hot
- 34what rotates around the earth every 29.5 days at the same time as the earth?the moon
- 35the moon pulls the tides because of...it's gravitational pull is not strong enough to pull the earth towards it but it can pull the water
- 36what are the 4 main phases of the moon?New moon, first quarter, full moon, last quarter
- 37what are the phases all of the moon?waxing crescent, 1st quarter, waxing gibbous, full moon, waning gibbous, 3rd quarter, waning crescent
- 38when the moon passes behind earth's shadow this is called alunar eclipse
- 39what are the 2 parts of the earth's shadow?penumbra and umbra
- 40a total eclipse is when the moon goes through the...umbra
- 41a partial eclipse is when the moon goes through thepenumbra
- 42What is the study of the origin and changes in the universe called?cosmology
- 43the universe is what 2 things?homogeneous and isotropic
- 44what is the theory that claims the universe was a singularity that contained all the matter in it then exploded because of extremely high temperatures and pressure,the big bang theory
- 45What is 3 points of evidence of the big bang theory?The galaxies are moving away from each other
Nucleosynthesis
Background radiation - 46how long does one rotation take?24 hours
- 47mercury, venus, earth and mars are calledterrestrial planets
- 48jupiter, saturn, uranus and neptune are calledthe gas giants
- 49when moons or asteroids get to close to a gas giant they explode and then they create...the rings around the planet
- 50what is the order of the planetsmercury, venus, earth, mars, jupiter, saturn, uranus, neptune
- 51brightness, age, temperature, distance and chemical combinations are all whatproperties of a star
- 52A space rock that orbits around the sun is called anasteroid
- 53a space rock that collides with the sun is called ameteor
- 54a space rock that penetrates through earth's atmosphere and hits the ground is called ameteorite
- 55a ball of ice and dust is called acomet
- 56an artificial body placed to orbit around the earth is called asatellite
- 57how are constellations used?navigation, agriculture
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- Grade 9 Science Flashcards on astronomy review, created by Mikyah Ansty on 05/06/2017.
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- Mikyah Ansty
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