More heavily cratered regions are olderDifferentiation: heavier elements sink to the middle8. SunLocation of the sun at sunset: North west in CUZenith: Directly Ahead98% hydrogen and helium gas9. Half life1 half life-> 50, 2 half lives -> 25, 3 half lives -> 12.5Speed of light = 3.97x10^1310. More on planets’Mercury, the smallest planet, is only a little bigger than Earth’s moon, and like the Moon, is covered in craters.Venusis the closest planet in size and mass to Earth, but its thick, toxic atmosphere produces a runaway greenhouse effect that leaves the surface hot enough to melt lead.Earth’soceans—the presence of liquid water in abundance on the surface—make it unique in the solar system.Marsis a frozen desert planet. Like Earth, it has seasons, weather, polar ice caps, volcanoes, and canyons11. Comets/Asteroids
Comets have 3 parts (Nucleus, coma, tail) (only have tails when by sun)Stonys (94% of meteorite falls) (rocky composition)
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