Why do we think Mercury has so many tremendous cliffs?
They were probably formed by tectonic stresses when the entire planet shrank as its over cooled
A planet that has a low density composed mostly of hydrogen and helium, with many moons and a ring system
Why is the sky blue?
Gas molecules in air scatter blue light more effectively than red light. The sky is blue because of the scattered blue light
The moon Tritan
Will some day break up into pieces as it gets too close to Neptune and its pieces will orbit Neptune most likely making a splendid ring system
When we see a region of a planet or moon that is not as heavily cratered as other regions on the same planet or moon we conclude that,
The surface in this region is younger than the surface in more heavily cratered regions
We have sent a space craft out to and returned samples of dust from a comet's tail back to Earth.
Why did the solar system heat up as it collapsed?
As the cloud shrank, its gravitational potential energy was converted to kinetic energy which is thermal energy or heat
How does the green house effect work?
Sunlight reaches the surface of the earth and heats it. The warm surface then gives off thermal emission radiation in the infrared which is absorbed by special greenhouse gases in the atmosphere
I am standing on a terrestrial celestial object that has a very hot interior and it's actively trying to cool itself by a process known as plate tectonics. Where am I?
Why has Earth so far been able to maintain a fairly stable climate?
Because of the carbon dioxide cycle
If a space craft enters the Roche Limit of a Jovian it will be destroyed by the gravitational forces consequently all crafts fly outside the Roche limit
What evidence do we have that tells us stars are still forming today?
We observe stars forming and they are always found within interstellar clouds of gas
Where do the particles in the plasma torus that surrounds Jupiter originate from?
Volcanoes on the moon Io
What does the surface of Venus show?
Many volcanic features such as corona as well as a few impact craters that are evenly spread over the entire surface
Water erosion occurred when the polar ice caps completely melted 3 billion years ago. Since that time there have been no polar caps
Asteroids are too small to achieve a proper orbit around the Sun and consequently remain stationary in space
The atmosphere at the Moon and Mercury is composed of CO2 gas and and has an atmosphere pressure greater than that on Earth
According to our theory of solar system formation, why do we fins some exceptions to the general rules and patterns of the planets?
Most of the exceptions are the result of giant impacts
Photographs in visible wavelengths from space show the actual surface of the moon Titan as there is no cloud coverage
Why is Venus farther from the Sun than Mercury but still hotter?
The greenhouse effect on Venus is vert strong making it the hottest planet in the solar system
Saturn is the least dense of all of the planets- in fact its density is less than that of water
What is the most important physical factor in determining if a planet will result in a Jovian or terrestrial?
The temperature where the planet formed in the nebula
The Kuiper Belt
Comets that orbit in the same direction as the planets orbit and at distances from about Neptune's orbit to about twice Pluto's orbit
The maria are best described as being formed by what?
Lava plains formed as runny lave gradually filled in a large impact crater basins and hardened
Internal pressures in Jupiter and Saturn are high enough that a large layer of liquid metallic hydrogen is present in the interior of these planets
You are walking along a dry river bed. A gentle wind is blowing sane in your face. In the distance you spy the largest volcano in the solar system. Where are you?
What is the first 100 million years of our solar system development called?
The period of heavy bombardment