You now can view antique maps of Mars from over a century ago, as well as the latest images from today's Mars spacecraft. In addition, you can go on virtual flybys with NASA's Mars Odyssey and Mars Reconnaissance Orbiter, and get guided tours of the planet from Public Radio's Ira Flatow and Bill Nye, the Science Guy.

For a quick tutorial of the new Mars in Google Earth features, check out . Below is a brief summary of the highlights:

To travel to the Red Planet, go to the top toolbar and click "Mars."

This flies you to the Mars, where you can explore current maps or travel back in time to see antique maps by astronomers Giovanni Schiaparelli, Percival Lowell, and others:

For a present-day look at Mars, select images from a variety of modern spacecraft, including the Phoenix and Beagle2 landers and the Opportunity and Spirit rovers: