Tuesday, January 23, 2018 | ePaper

Steep slopes on Mars reveal structure of buried ice

  • Print


A cross-section of underground ice is exposed at the steep slope that appears bright blue in this enhanced-color view from the HiRISE camera on NASA's Mars Reconnaissance Orbiter. The scene is about 550 yards wide. The scarp drops about 140 yards from th

NASA  :
Researchers using NASA's Mars Reconnaissance Orbiter (MRO) have found eight sites where thick deposits of ice beneath Mars' surface are exposed in faces of eroding slopes.
These eight scarps, with slopes as steep as 55 degrees, reveal new information about the internal layered structure of previously detected underground ice sheets in Mars' middle latitudes.
The ice was likely deposited as snow long ago. The deposits are exposed in cross section as relatively pure water ice, capped by a
layer one to two yards (or meters) thick of ice-cemented rock and dust. They hold clues about Mars' climate history. They also may make frozen water more accessible than previously thought to future robotic or human exploration missions.
Researchers who located and studied the scarp sites with the High Resolution Imaging Science Experiment (HiRISE) camera on MRO reported the findings today in the journal Science. The sites are in both northern and southern hemispheres of Mars, at latitudes from about 55 to 58 degrees, equivalent on Earth to Scotland or the tip of South America.
 "There is shallow ground ice under roughly a third of the Martian surface, which records the recent history of Mars," said the study's lead author, Colin Dundas of the U.S. Geological Survey's Astrogeology Science Center in Flagstaff, Arizona. "What we've seen here are cross-sections through the ice that give us a 3-D view with more detail than ever before."
The scarps directly expose bright glimpses into vast underground ice previously detected with spectrometers on NASA's Mars Odyssey orbiter, with ground-penetrating radar instruments on MRO and on the European Space Agency's Mars Express orbiter, and with observations of fresh impact craters that uncover subsurface ice. NASA sent the Phoenix lander to Mars in response to the Odyssey findings; in 2008, the Phoenix mission confirmed and analyzed the buried water ice at 68 degrees north latitude, about one-third of the way to the pole from the northernmost of the eight scarp sites.

More News For this Category

Presidential poll Feb 19

Staff reporter :The Jatiya Sangsad will elect the next President of Bangladesh on February 19 as the tenure of incumbent President Abdul Hamid nears an end."I came to know

A President not sure of what he wants complicates shutdown impasse

The New York Times, Washington  :When President Trump mused last year about protecting immigrants brought to the United States illegally as children, calling them "these incredible kids," aides implored

Gono Forum Chairman Dr. Kamal Hossain addressing the discussion titled ' National Unity a must to resolve the Present Political Stalemate organised at the Jatiya Press Club on Monday.

Gono Forum Chairman Dr. Kamal Hossain addressing the discussion titled ' National Unity a must to resolve the Present Political Stalemate organised at the Jatiya Press Club on Monday.

.

No end to eyesores at Taj Mahal as repair work drags on

AFP  :Tourist Muskan Mahuwakar pictured the Taj Mahal as a dazzling vision of symmetry and beauty but upon reaching the monument, she-like thousands of other visitors-was disappointed to find it

10,40,51,883 voters in country: Anisul

BSS, Dhaka :According to the draft voter list published on January 2, 2018, the number of voters in the country is 10,40,51,883.Law, Justice and Parliamentary Affairs Minister Anisul Haque,

Gaza under commercial strike amid worsening conditions

Gaza under commercial strike amid worsening conditions

Al Jazeera News  :A general strike has been called for by the private sector in the Gaza Strip to protest worsening living conditions amid the ongoing blockade, which is

BNP for constitutional amendment for polls-time govt

UNB, Dhaka :BNP senior leader Khandaker Mosharraf Hossain on Monday urged the government to amend the constitution to include the provision of having an election-time government."The Prime Minister has

IU BCL men snatch 3 drug addicts from police

UNB, Kushtia :The activists of Bangladesh Chhatra League (BCL) of Islamic University (IU) unit snatched away three arrested drug addicts from police on the campus on Sunday evening.Sub-inspector of

Senate committee calls for child abusers to be hanged

Dawn.com :The Senate's Standing Committee on Interior on Monday passed a resolution condemning the abduction and sexual abuse of children and recommending that the culprits in such cases be

Tillerson visits new US embassy in UK that Trump criticized

Reuters, London :Secretary of State Rex Tillerson visited the new $1 billion U.S. embassy in London on Monday, just days after his boss Donald Trump criticized the move to