PDA

View Full Version : Underground Explosions Carve Twin Craters on Mars



shadowstalker
17th April 2013, 15:36
Underground Explosions Carve Twin Craters on Mars (http://www.weather.com/news/science/space/twin-mars-craters-underground-explosions-20130416)

Dramatic explosions deep under the Mars surface, possibly involving ice, are believed to have created a pair of massive craters spotted side-by-side in satellite images taken in January by the European Space Agency.

What makes the twin craters remarkable is the central pit found in each, which indicate the presence of water on or just below the surface of the red planet.

ESA
The smaller rectangle shows the region covered by the two craters. The northernmost is called Arima, while the southernmost remains unnamed.

In a report on the craters published on April 11, ESA scientists proposed a range of theories on what caused them.

"When an asteroid hits the rocky surface of the planet, both it and the surface are compressed to high densities," scientists with the ESA reported last week. "Immediately after the impact, the compressed regions rapidly de-pressurize, exploding violently."

The crater pits may form when the ice or rock in a meteor melts after impact, draining away through fissures in the crater. Another theory researchers proposed is that ice just under the surface rapidly heats up on impact, and vaporizes in an explosion immediately after.

More in above link

sirdipswitch
17th April 2013, 16:32
Probly just our guys buildin another underground base. ccc.

Hervé
17th April 2013, 17:10
http://projectavalon.net/var/esa/storage/images/esa_multimedia/images/2013/04/arima_twins/12612929-3-eng-GB/Arima_twins_node_full_image.jpghttp://projectavalon.net/var/esa/storage/images/esa_multimedia/images/2013/04/arima_twins/12612929-3-eng-GB/Arima_twins_node_full_image.jpghttp://spaceinimages.esa.int/var/esa/storage/images/esa_multimedia/images/2013/04/arima_twins/12612929-3-eng-GB/Arima_twins_node_full_image.jpg

A color view of two craters, both roughly 50 kilometers in diameter, in the Thaumasia Planum region just south of Vallis Marineris at approximately 17°S / 296°E and have a ground resolution of approximately 25 meters per pixel. The northern (right) crater is named Arima, while the southern (left) crater is unnamed. (Courtesy European Space Agency)



http://spaceinimages.esa.int/var/esa/storage/images/esa_multimedia/images/2013/04/arima_twins_topography/12612851-1-eng-GB/Arima_twins_topography_node_full_image.jpg

A color-coded overhead view of the craters, based on an ESA Mars Express High-Resolution Stereo Camera digital terrain model of the Thaumasia Planum region on Mars, taken on January 4, 2013. The color coding reveals the relative depth of the craters, in particular the depths of their central pits. (Courtesy European Space Agency)

Snookie
18th April 2013, 03:46
I wonder if these craters could have been created by the devastation that was a result of the ancient alien wars that supposedly happened on Mars. After all Mars is the god of war.

Or maybe debris from an exploding planet like Tiamat.

araucaria
18th April 2013, 06:40
I am very doubtful of the impact theory of craters. If you hit a tennis ball on a clay court, the mark it leaves will be elliptical to cylindrical, depending on its speed and angle. To make a round mark requires a vertical bounce. The fact that you never see elliptical craters means that all meteors would have to be landing vertically, which makes little sense. Anything bubbling up on the other would make the circular craters we see.