H205 Cosmic Origins. Today: Forming the Solar System Finish EP6. APOD. The Origin of the Solar System. All objects in the Solar System seem to have formed at nearly the same time, out of the same original cloud of gas and dust
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Interstellar clouds are common between the stars in our galaxy and this suggests that most stars may have planets around themThe Solar Nebula Hypothesis
Dust grains are very small - about 4000 could fit across a sucker stick
Astronomers have observed many gas/dust disks where planets may be forming
Gas molecules bind together to form liquid or solid particles
On Earth, water vapor condenses to form clouds
Steam condenses on the bathroom mirrorCondensation
Lunar Formation Before Apollo
The Spongmonkies: We Like The Moon
It’s the little dot inside!
Earth rocks contain water!
It’s not green cheese!
Maybe there is a tiny iron core inside
But, unlike the Earth, the Moon has very little iron
And Moon rocks are dry!
Told through the art of William Hartmann
The Earth gobbled it!
Asteroid Gaspara, image from Galileo spacecraft
Asteroid Ceres from Hubble images
Asteroid Itokawa was visited by a Japanese spacecraft in 2005. The spacecraft will return to Earth in 2010.Asteroid Composition
The gaps are caused by the same resonance process that causes the gaps in Saturn’s rings
Trojan asteroids are two loose swarms located along Jupiter’s orbit, 60° ahead and 60° behindAsteroid Belt Structure
Origin of Elements