William Herschel discovered Uranus in 1781 when he was charting faint stars in the
A suspected Eighth planet was thought to be behind Uranus because of small
discrepancys in the planets predicted orbits.
Two mathematicians, John Adams and Urbain Leve
Instead, we see only different levels in the topmost layer, which accounts for Saturn's
rather uniform appearance.
What does Saturns shape tell us about its deep interior?
Saturn's low average density indicates that, like Jupiter, it is composed primarily
. Saturns Rings appear to disappear as Saturn orbits the sun.
Ring Crossing is when the rings of Saturn seem to disappear, it will occur in 2010.
are roughly the same as Jupiters, except they are much thicker w/ fewer holes, so we
Mars appears to follow a big circle in the sky and also executing retrograde loops.
The greenhouse effect:
is not present on Mars because:
- the temperatures are already to low which allows for too much CO2 to escape the
is the closest it gets to Earth during opposition because earth is between Mars and
the sun making it seem very bright.
The Canals on mars are highly cratered and eroded areas, water may have existed
their at one point in time, the canals were natura
Briefly describe Keplers three laws
- of planetary motion.
The orbital paths of the planets:
are elliptical, not circular, with the sun at one focus.
An imaginary line:
connecting the sun to any planet sweeps out equal areas of the ellipse in equal interv
Jupiter is comprised:
of gas which undergoes increasing amounts of pressure.
As you go farther into the planet.
This is where it eventually becomes liquid.
Jupiters Electric Field
comes from the rapidly spinning liquid metallic hydrogen core.
1. What contributions to modern astronomy were made by:
Islamic astronomers during the Dark Ages of medieval Europe?
Chinese recorded supernova information.
They called them guest stars.
Islamic designed trig to determine precise holy
This has the effect of making a diurnal day slightly longer than a sidereal day.
Stars shift slightly each night relative to horizon.
Why are there seasons on earth?
Earths rotation around sun:
this leaves darkened hemisphere in a slightly different direc
This is of average position of all the matter making up the two bodies
-The orbit of a planet around the sun is an ellipse
This is with the center of mass of the planet-sun system at one focus.
The true relationship between the semimajor axis of the plane