What is a GCM?

Why study martian weather and climate?

What are some basic facts about Mars? How does it compare to the Earth?

Does it ever rain or snow on Mars?

Is there liquid water on Mars or below its surface?

Why isn't the Martian sky blue like the Earth's?

Is there life on Mars?

Was Mars always so dry and cold? Were there once rivers and seas?

Why is the current atmosphere so thin and mainly carbon dioxide?

What causes dust storms on Mars?

Mars has the largest volcanoes in the solar system. Are the Martian volcanoes extinct?
If so, when did this happen and why?

**Written by Dr. David Catling, formerly of the Mars General Circulation Modeling Group, with comments from other scientists who study Mars including Dr. Bob Haberle, Dr. Jeff Hollingsworth, Dr. Mike Mellon, and Dr. Jim Murphy.