More heavily cratered regions are older Differentiation: heavier elements sink to the middle 8. Sun Location of the sun at sunset: North west in CU Zenith: Directly Ahead 98% hydrogen and helium gas 9. Half life 1 half life-> 50, 2 half lives -> 25, 3 half lives -> 12.5 Speed of light = 3.97x10^13 10. More on planets’ Mercury, the smallest planet, is only a little bigger than Earth’s moon, and like the Moon, is covered in craters. Venus is 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’s oceans—the presence of liquid water in abundance on the surface—make it unique in the solar system. Mars is a frozen desert planet. Like Earth, it has seasons, weather, polar ice caps, volcanoes, and canyons 11. 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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