We know that when the rock formed, it had half as many sibling atoms as daughter atoms. The parent atoms have a half life of 1 billion years. On the graph below, draw in the typical spectrum of the Sun's radiation and the Earth's radiation. We know that Jupiter has an internal heat source because when we look at the planet with longer and longer wavelengths, the width of the spectral lines in Jupiter's spectrum get broader and broader. Titan, however, has a very thick atmosphere while Callisto has no atmosphere to speak of.
Titan is roughly the same mass and size as Earth's moon.
State what material each tail is made from and why each tail behaves differently. Explain two reasons why the terrestrial planets have this kind of structure.