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Friday, September 21, 2007

NEW EVIDENCE: Mars 'Seven Sister' Cave Skylights?

Seven very dark holes on the north slope of a Martian volcano (known as the 'Seven Sister Caves') have been proposed as possible cave skylights, based on day-night temperature patterns suggesting they are openings to subsurface spaces. These six excerpts of images taken in visible-wavelength light by the Thermal Emission Imaging System camera on NASA's Mars Odyssey orbiter show the seven openings. [Video 1]

The candidate cave skylights are (A) "Dena," (B) "Chloe," (C) "Wendy," (D) "Annie," (E) "Abby" (left) and "Nikki," and (F) "Jeanne." Arrows signify north and the direction of illumination.

Evidence that the holes may be openings to cavernous spaces comes from the temperature differences detected from infrared images taken in the afternoon and in the pre-dawn morning. From day to night, temperatures of the holes change only about one-third as much as the change in temperature of surrounding ground surface. [Video 2]

"They are cooler than the surrounding surface in the day and warmer at night," said Glen Cushing of the U.S. Geological Survey's Astrogeology Team and of Northern Arizona University, Flagstaff, Ariz. "Their thermal behavior is not as steady as large caves on Earth that often maintain a fairly constant temperature, but it is consistent with these being deep holes in the ground." [Video 3]

1 comment:

Darnell Clayton said...

The Space Fellowship [link] is reporting that these caves would probably not be suitable for past or future life.

“These are at such extreme altitude, they are poor candidates either for use as human habitation or for having microbial life,” Cushing said. “Even if life has ever existed on Mars, it may not have migrated to this height.”

Although it would be a steep climb for any colony, I wonder if deep beneath these caves we would find precious metals or minerals?

I'm not a volcanic expert, so all we may find is useless lava rock (wouldn't that be fun?)