Category Archives: Mars

Digging Mars

The Saga of the Dirt (and an Update)

https://i0.wp.com/phoenix.lpl.arizona.edu/images/gallery/sm_4219.jpg?resize=295%2C295I need the guys working on the dirt experiments on the Mars Phoenix Lander to help me with my floor-cleaning methods. I was doing some tidying up in my overstuffed office the other day. It’s something I do when I’m stuck in the middle of writing something and a case of temporary brain freeze hits. Usually I take a break and go get a coffee or something, but it’s too hot for coffee these days. So, sometimes I’ll do a little rearranging of the stuff in my office.

So, I cleared out some space where I’d had some books and papers piled up, and noticed a little dust and dirt on the floor. I swept it up into the dust pan, but when I went to toss it into the trash, I missed and the dirt hit a box of papers that I was getting ready to recycle.

All this put me in mind of the Mars Phoenix lander. (Yes, I really DO think that way…) The other day the digger arm (technical term) got a good clump of dirt from the surface and swung around to deposit the dirt into one of the lander’s onboard ovens. It didn’t actually miss the oven. It landed more or less in the right place, but apparently it was too clumpy to break into small enough pieces to make it into the oven. So, unlike my dirt-tossing abilities, there’s not much of a problem with the lander arm and its delivery method. It would appear that the dirt on Mars — at least at that location — clumps together rather tightly. And, the lander is now learning to shake those dirtballs apart before it can bake ’em. I should be so talented!

UPDATE: They’ve got dirt in the oven! Check out the Phoenix Lander site for more details. https://i0.wp.com/phoenix.lpl.arizona.edu/images/gallery/sm_4470.jpg?w=474

Mars Phoenix Whistles As It Lands

Watch and Listen As Phoenix Descended to Mars

The folks at the European Space Agency have posted a video and sound files made from data recorded on board Mars Express as the Phoenix lander made its way to the Martian surface.

The animation shows the signal of Phoenix’s descent. The spike in the animation, between frequencies of 7 and 8 kiloHertz, shows the transmission from Phoenix itself. The lander’s signal can be seen in the animation starting from about 342 seconds after the start time and disappears at about 1085 s. This shows Mars Express picking up on the Phoenix signal and tracking it while closing in on the lander; the closest Mars Express got to Phoenix was 1,550 kilometers.

As Mars Express flew away, the lander deployed its parachute, separated from it and landed, the signal from the lander was cut off. The shift of the spike seen in the animation, is due to the so-called Doppler effect, which is very similar to what we hear when listening to the whistle of a passing train.
You can hear a sound file of the descent and landing on the same page linked above (warning: if you have tinnitus, turn your speakers down to a lower volume).  The image below is from the Mars Reconnaissance HiRise imager.