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What causes the deep blue color of Neptune?

Study this graph of the size and densities of the planets and some of their satellites. Each color represents a different class of planetary bodies. Which grouping represents the inner planets?

Click on the possible explanations for Mercury’s large core. Choose the two most likely.

Write brief but coherent answers to the following questions in the spaces provided. You can use an outline form if you desire, but complete sentences are also acceptable.

What do the arrows in this image on the surface of Pluto show?

Why do the icy outer layers of Jupiter’s satellites increase in thickness as one moves from Europa to Callisto?

How did Earth’s atmosphere form?

The oldest geologic feature in the following photo is ________.

Supernovas are the result of ________.

Which letter marks the youngest (happened most recently) lava flow that crosses this part of the lunar maria?