Category Archives: Mars

Gimme that Good, Ol-Time Planetary Science

Where Getting There is Half the Fun!

“Syrtis Base, Mars Explorer II here. We are on final approach to Stickney Crater. Request permission for landing.”

“Roger that, ME-II. Your approach is good. You are cleared for landing.”

Someday a bright bunch of folks who are maybe only in first grade or middle school right now are going to be coming in for final approach to Phobos, one of the two moons of Mars. They’ll be explorers, armed with scientific equipment and a sense of adventure, ready to stick themselves on this little world and figure out why looks the way it does.

When they get there, this might very well be the scene that confronts them. It’s Stickney Crater, a honkin’ big scar on the surface of this little moon. Stickney has its own craters inside, and the whole moon is scarred by some mysterious grooves that planetary scientists haven’t quite figured out yet.

Something happened to this little world, either when it first formed (maybe as a knock-off from Mars or as part of the asteroid belt), or later on when Mars and the other inner planets were bombarded by interplanetary debris. Either way, it’s gotten pretty beat up over the eons since it was first born.

While we may not be able to go to Photos ourselves just yet, we can explore it in high-resolution images released by the Mars Reconnaissance Orbiter’s HiRise camera. They’ve just released a series of high-resolution images that you can download and enlarge on your computer screen. See for yourself the cratered, grooved surface of the Mars moon our children or grandchildren may someday explore!

It’s Not Dead, Jim

It’s Alive!!!! (In the Geological Sense, That Is…)

For those of you who thought Mars was a dead planet, this just in: there are avalanches out there, Captain!

The ongoing in situ exploration of Mars, which includes two rovers, and three orbiters (plus another spacecraft headed out to Mars by May of this year) is showing us a lot of Mars for our money. Just about every day, and more than once a day, you can log into the Mars missions web pages and see the latest from the Red Planet. And that doesn’t even count the great  images that Hubble Space Telescope gets every once in a while.

If you have been checking out Mars images pretty frequently, you’ll know that the place is far from being a dead planet. Sure, it has no biological life (that we know of , so far), but in every other way that counts, it is an evolving planet. The atmosphere changes with the seasons, its surface is constantly sculpted by winds and possibly the action of tectonic forces, and its polar caps grow and shrink throughout the year. If it had some liquid water on the surface, we’d probably see that change as the years go by. As it is, we are limited to watching what happens with ice and dust and rocks, but Mars hasn’t let us down. The Red Planet is giving us quite a show for our exploration money. And that’s the beauty of sending long-term missions to other planets: we get to see them change over time, which lets us understand them far better than if we only had snapshots to work from.

The latest in planetary surface modification at Mars comes to us from the High Resolution Imaging Science Experiment on the Mars Reconnaisance Orbiter. It caught a sequence of events on near the Martian north pole that are clearly action shots of an avalanche in progress. Dust and ice are tumbling down a 700-meter (2,300-foot) tall cliff and settling out on a gentler slope below. It’s pretty dramatic-looking, isn’t it?

Mars avalanche