Midterm1 mean 64%
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
Inner solar system: Mercury, Venus, Earth, Mars
Outer solar system: Jupiter, Saturn, Uranus, Neptune, many dwarf planets and
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.
•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)
•Has a magnetic field, but we don’t know why
•Currently being explored by the MESSENGER probe (second time ever we have visited Mercury!)
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
Unusually big moon
Only planet we have to live on
Very thin co2 atmosphere
Many huge, extinct volcanoes
Was probably Earth-like in the distant past(wet & warmish)
In between orbits of mars and Jupiter