8th Grade Earth Science
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| what is the other name for a stellar nursery | Nebula
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| what type of galaxy is the Milky Way | spiral
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| how are galaxies classified | shape/size
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| why does the moon have a lot of craters but the earth does not | moon doesn't have an atmosphere for protection
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| what is the universe doing | expanding
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| what is a light year | distance light travels in a year
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| what is the difference between a constellation and a galaxy | constellation has a few stars, while a galaxy has billions
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| what elements make up most of the sun | hydrogen and helium
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| what causes a cloud of gas and dust to condense | gravity
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| According to H-R diagrams, what group does a star spend most of its life | main sequence
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| what are the inner planet? what are they called? | a planet that lies in the astroid belt. Terrestrial planets
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| what are the outer planets? what are they also called | a planet who's orbit lies outside the astroid belt. Jovian planets
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| what are most of the galaxies doing relative to each other | moving away from each other
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| How does our Sun compare to the other stars | it is the closest star to Earth, and it has an average temperature and size
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| What causes a star to emit electromagnetic energy | a nuclear fusion
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| what is the current proof that the Universe is expanding | when things move away they emit red waves, the galaxies are producing stronger and stronger wavelengths that before
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| what keeps a satellite in orbit around another planet | satellites velocity and planet's gravitational pull
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| why is the surface of Venus so hot? what gases make up the atmosphere | has a thick atmosphere made of carbon dioxide and nitrogen which keep the heat in
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| why is the surface of Mercury so hot | closest to the sun
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| where did the Asteroids come from | the astroid belt in between Mars and Jupiter
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| Why do scientists think that there once was life on Mars | it has the right conditions for life
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| What is the name of the beginning formation of a star | a gas cloud; molecular clouds
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| describe the sequence of events that our Sun will go through until its death | main sequence-->giant-->white dwarf
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| how do Galaxies that are further away from us compare in speed to galaxies that are closer | more distant a galaxy is, the farther it is moving away
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| Graph the relationship between distance from the Sun and period of revolution | Kepler's Third Law implies that the period for a planet to orbit the Sun increases rapidly with the radius of its orbit
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| How does the color of the star compare to its temperature | closer to blue = hotter
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| how is mars like earth | -tilted at a similar angle
-four seasons
-polar ice caps
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| order of planets closest to least to the Sun | Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune
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| Astronomical Unit? | The average distance between Earth and the Sun
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