Astronomy Picture of the Day 10-05-03

Explanation: Apollo 12 was the second mission to land humans on the Moon. The landing site was picked to be near the location of Surveyor 3, a robot spacecraft that had landed on the Moon three years earlier. In the above photograph, taken by lunar module pilot Alan Bean, mission commander Pete Conrad jiggles the Surveyor spacecraft to see how firmly it is situated. The lunar module is visible in the distance. Apollo 12 brought back many photographs and moon rocks. Among the milestones achieved by Apollo 12 was the deployment of the Apollo Lunar Surface Experiments Package, which carried out many experiments including one that measured the solar wind.

34 years ago. Yikes. To put that in perspective from my own viewpoint:

I was 6 years old! First grade!

Here's an unusual tidbit: I don't post the part which tells the next day's APOD because it's not always informative and the link won't work until the next day anyway. But I'll tell you what it says for 10-06-03: "Southern Ozone". Hey, I know that gov't agency beancounters just repeat what they're told. But I hope that Messrs. Nemiroff and Bonnell would know better than to take incomplete data (and false-color imagery presented as real) and peddle it as gospel.

We'll see what tomorrow brings per APOD.

Mysterious 'giant domes' of Europa could be explained
UNIVERSITY OF COLORADO-BOULDER NEWS RELEASE
Posted: September 2, 2003

A new University of Colorado at Boulder study of Jupiter's moon Europa may help explain the origin of the giant ice domes peppering its surface and the implications for discovering evidence of past or present life forms there.

Assistant Professor Robert Pappalardo and doctoral student Amy Barr previously believed the mysterious domes may be formed by blobs of ice from the interior of the frozen shell that were being pushed upward by thermal upwelling from warmer ice underneath. Europa is believed to harbor an ocean beneath its icy surface.

But the scientists now think the dome creation also requires small amounts of impurities, such as sodium chloride or sulfuric acid. Basically the equivalent of table salt or battery acid, these compounds melt ice at low temperatures, allowing warmer, more pristine blobs of ice to force the icy surface up in places, creating the domes.

"We have been trying for some time to understand how these ice blobs can push up through the frozen shell of Europa, which is likely about 13 miles thick," said Pappalardo of the astrophysical and planetary sciences department. "Our models now show that a combination of upwelling warm ice in the frozen shell's interior, combined with small amounts of impurities such as sodium chloride or sulfuric acid, would provide enough of a force to form these domes."

A paper on the subject co-authored by Pappalardo and Barr was presented at the annual Division of Planetary Sciences Meeting held Sept. 2 through Sept. 6 in Monterey, Calif. DPS is an arm of the American Astronomical Society.

Europa appears to have strong tidal action as it elliptically orbits Jupiter - strong enough "to squeeze the moon" and heat its interior, said Pappalardo. "Warm ice blobs rise upward through the ice shell toward the colder surface, melting out saltier regions in their path. The less dense blobs can continue rising all the way to the surface to create the observed domes."

The domes are huge - some more than four miles in diameter and 300 feet high - and are found in clusters on Europa's surface, said Barr, who did much of the modeling. "We are excited about our research, because we think it now is possible that any present or past life or even just the chemistry of the ocean may be lifted to the surface, forming these domes. It essentially would be like an elevator ride for microbes."

Barr likened the upwelling of warmer ice from the inner ice shell to its surface to a pot of boiling spaghetti sauce. "The burner under the pan sends the hottest sauce to the top, creating the bubbles at the surface," she said. "The trouble is Europa's icy skin is as cold and as hard as a rock."

The idea that either small amounts of salt or sulfuric acid might help to create Europa's domes was Pappalardo's, who knew about similar domes on Earth that form in clumps in arid regions. On Earth, it is salt that is buoyant enough to move up through cracks and fissures in rock formations to form dome clusters at the surface.

"In addition, infrared and color images taken of Europa by NASA's Galileo spacecraft seem to indicate some of the ice on the surface of these domes is contaminated. Impurities seen at the surface are clues to the internal composition of the Jovian moon, telling of a salty ice shell," he said.

"The surface of Europa is constantly being blasted by radiation from Jupiter, which likely precludes any life on the moon's surface," said Barr. "But a spacecraft might be able to detect signs of microbes just under the surface."

Both Pappalardo and Barr also are affiliated with CU-Boulder's Laboratory for Atmospheric and Space Physics. The project was funded by NASA's Exobiology Program and Graduate Student Research Program.

Pappalardo recently served on a National Research Council panel that reaffirmed a spacecraft should be launched in the coming decade with the goal of orbiting Europa. He currently is part of a NASA team developing goals for the Jupiter Icy Moons Orbiter mission.

The scientific objectives of the mission probably will include confirming the presence of an ocean at Europa, remotely measuring the composition of the surface and scouting out potential landing sites for a follow-on lander mission.

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