Video Link: https://www.youtube.com/watch?v=aSYZMa6b3lU

Teach Astronomy - Terrestrial Planets
http://www.teachastronomy.com At first glance the four terrestrial planets, Mercury, Venus, Earth, and Mars, have few similarities. Mercury is a hot, airless, moon-like planet. Venus has a dense carbon dioxide atmosphere and no satellite. Earth has a unique atmosphere of nitrogen and oxygen with extensive liquid water oceans and a large moon. Mars has two small moons, a thin carbon dioxide atmosphere, and polar caps made of solid carbon dioxide. Nonetheless, there are similarities among these planets and the rules of comparative planetology apply to them. All but Mercury have shown evidence for geological activity at some point in there histories. All but mercury have some component of carbon dioxide, a relatively heavy gas, in their atmosphere. And all planets as far as we can tell have a similar global chemical composition and the presence of larger, massive, dense cores.From:astropediaViews:88 0ratingsTime:01:08More inEducation

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Teach Astronomy - Terrestrial Planets - Video