Earth and our Solar System Review 2
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12 Terms
Number of stars
100-400 billion
Astronomical unit
Average distance between earth and sun
Nearest star
4.3 light years away
Light year
How far the distance of light travels in a year
Planetary system
Stars with planets around it
Planetary nebular theory
Theory of how the solar system is made from gas and dust orbiting the Sun, which clumped up together to form the planets.
Supernova causes
Formation of new stars and nebula to expand and brighten, collapse
Sun and planets age
4.6 billion years old
Weight
How much gravity pulls on an object
Planet simal
Chuncks of rocks in space
Planetary acceleration
When something speeds up because a planet pulls on it with gravity
Name the three galaxies
Elliptical
Irregular
Spiral
Note 
Flashcards (72)