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Astronomy 8
stars
| Question | Answer |
|---|---|
| Name the 3 early astronomers? | Ptolemy, Copernicus, and Tycho Brahe |
| what is one light-year unit equal to? | The distance that light travels in 1 year (9.5 trillion Kilometers/6 trillion miles) |
| How are stars created? | Started through a ball of gas and dust, gravity pulls the gas and dust together into a nebula, nuclear fusion combines hydrogen atoms |
| How do a stars end? | stars usually slowly burn out like a candle(red giant) or sometimes they explode (super nova)or into black holes |
| What is the Hertzsprung-Russell diagram | a graph that shows relationship b/w a star's surface temperature and absolute magnitude |
| What is a black hole? | an object that is so massive that even light cannot escape it's gravity |
| What is a galaxy? | a collection of stars, dust, and gas held together by gravity |
| What are spiral galaxies and a example of one? | have a bulge at the center and spiral arms (ex: milky way) |
| What are elliptical galaxies? | a massive blob of stars |
| what is the difference b/w meteors and asteroids? | Asteroid: a small, rocky body that orbits the sun, left over material from the formation of a solar system Meteors: are most likely pieces of an asteroid, and it is the bright streak of dust left by a meteorite as it burns up in our atmosphere. |
| What is a comet? | it moves around the ins like planets (ellipses) tail always points away from the Sun. |
Created by:
hcps-bryanttl2
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