AST101H1 Study Guide - Midterm Guide: Asteroid Belt, Real Gas, Oort Cloud

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16 Oct 2011
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Midterm1 mean 64%
Oct 19
Its important to change temperature for emit light
Suns peak is in visible light.
If you observe two stars in the same star cluster and see that one is red and the other
is green, what can you conclude about them?
The green one is either moving away from us or is hotter.
Motion and temperature
A pictorial tour of the solar system
A solar system consists of a star orbited by planets, moons, and lots of debris
(comets, asteroids, dust)
The orbits of the 8 planets are nearly circular. Many smaller bodies orbit in elliptical
orbits.
Inner solar system: Mercury, Venus, Earth, Mars
Outer solar system: Jupiter, Saturn, Uranus, Neptune, many dwarf planets and
comets
Terrestrial (earth-like) planets are small, rocky, have thin or no atmosphere, have few
moos, and occupy the inner solar system
Jovian (Jupiter-like): large, made of gas and liquid, have thick atmospheres, have
many moons, and occupy the outer solar system.
Mercury
No atmosphere, highly cratered surface
Rocky exterior with a huge iron core
Temperatures fluctuate between -170 oC and 425 oC(lead melts at 327 oC)
No moons
Has a magnetic field, but we don’t know why
Currently being explored by the MESSENGER probe (second time ever we have
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