Study Guide for Midterm2 B Study guide for midterm2 B.

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Astronomy & Astrophysics
Michael Reid

Midterm1 mean 64% Oct 19 It’s important to change temperature for emit light Sun’s 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 visited Mercury!) Venus  Thick co2 atmosphere, lots of possibly active volcanoes  About the same size as Earth  Runaway greenhouse effect makes it even hotter than Mercury 460C everywhere Earth  Wet planet  Unusually big moon  Only planet we have to live on Mars  Very thin co2 atmosphere  Many huge, extinct volcanoes  Was probably Earth-like in the distant past(wet & warmish) Asteroid belt  In between orbits of mars and Jupiter  Many th
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