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Chile Diary 4: ALMA… and Ceres?

By Br. Guy Consolmagno  |  1 May 2015

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This entry is part 39 of 98 in the series Diary

Our last stop on the Chile trip was San Pedro de Atacama, a hiker’s paradise that now serves as the headquarters for the APEX microwave telescope (a friend of mine was using it while we were there) and the ALMA microwave radio telescope array, located at 16,400 feet (5,000 meters). It’s so high up that you have to be examined by a doctor before they let you visit. Everyone in our group passed the test… except me. (I was on antibiotics, fighting a sinus infection I’d picked up in Denver.)

As I result, I don’t have first-hand descriptions… but these are some of the photos that Katie took and shared with us:

The gang at ALMA... except for me! The gang at ALMA… except for me!
The guys who made our ALMA trip possible, Fernando Comeron (ESO representative to Chile) and  Pierre Cox, ALMA director The guys who made our ALMA trip possible, Fernando Comeron (ESO representative to Chile) and Pierre Cox, ALMA director
Katie's view of the ALMA telescopes. Yes, that's snow Katie’s view of the ALMA telescopes. Yes, that’s snow

But along with the telescopes, we also got to visit a couple of the remarkable sites near San Pedro… the El Tatio hot springs and geysers (best seen at sunrise, which meant an early start for us) and the “Valley of the Moon”, a remarkable collection of mountains and valleys carved by wind and water.

And that’s where Ceres comes in. As you may recall (see Bob’s posts) the Dawn spacecraft is orbiting Ceres, getting closer and closer to the mysterious white spots seen on its surface. One theory has it that they are patches of ice left by geysers on the surface of Ceres. Well, here are some geysers at 14,000 feet in the dry desert of Chile:

Hot springs

But an equally possible theory is that the white spots are salt deposits left behind after the water evaporated into space. And that’s where the “Valley of the Moon” comes in.

As you may have heard, this desert only gets rain about once in a hundred years; but one of those times was just this past spring. And the rocks here are full of salts like gypsum, or even regular rock salt (NaCl as halite). They were the site of salt mines as recently as the 1960s. And with all that rain, a lot of salt got dissolved into the water… and then left behind as the water evaporated. So, for the moment, this valley has a remarkable white patina:

A panorama of the A panorama of the “Valley of the Moon” outside San Pedro, near the ALMA site, in the Atacama desert of Chile
Inspecting a salt mine Inspecting a salt mine

So maybe they should rename it, The Valley of Ceres?

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More Posts in this Series:
"Diary"

78  |  What Do We Lose When We Sacrifice Science?

By Br. Guy Consolmagno  |  27 May 2021  |  Sacred Space Astronomy

69  |  To err is human… to admit it, is science

By Br. Guy Consolmagno  |  25 Mar 2021  |  Sacred Space Astronomy

38  |  Should you (or someone you love) go to MIT?

By Br. Guy Consolmagno  |  14 Mar 2017

40  |  Another blog about the blog

By Br. Guy Consolmagno  |  21 Feb 2017

41  |  Chile Diary 2: Paranal

By Br. Guy Consolmagno  |  26 Apr 2015

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