Monday, November 19, 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

BNP started interviewing the party nomination aspirants to finalise the candidates who will contest in the next Parliamentary Elections with its party tickets held at Chairperson's Gulshan office on Sunday.

BNP started interviewing the party nomination aspirants to finalise the candidates who will contest in the next Parliamentary Elections with its party tickets held at Chairperson's Gulshan office on Sunday.

9 more killed in road crashes

Staff Reporter  :At least nine more persons were killed and several others injured in separate road crashes across the country on Sunday.In Rangpur, at least four more persons were

Brexit won't be easier if I'm ousted: May

BBC Online :Theresa May has told her critics that getting rid of her as PM would not make delivering Brexit any easier.Mrs May defended last week's draft agreement for

Khaleda seeks bail, challenges verdict

Staff Reporter :BNP Chairperson Khaleda Zia on Sunday filed an appeal with the High Court challenging the lower court verdict that sentenced her to seven years imprisonment in Zia

Ershad collects nomination paper for Dhaka-17 seat

BSS, Dhaka :Jatiya Party (JP) on Sunday collected nomination paper on behalf of JP Chairman Hussein Muhammad Ershad to contest in the upcoming 11th parliamentary election from Dhaka-17 constituency.Party's

Rohingya repatriation, relocation plans pushed back to 2019

Reuters, Cox's Bazar :Bangladesh's plans to tackle the Rohingya refugee crisis have been stalled until the new year with repatriation and relocation programs only likely to be revisited following

BNP submits list of cases to CEC

UNB, Dhaka :BNP on Sunday submitted a list of cases filed against its leaders and workers to Chief Election Commissioner KM Nurul Huda.A BNP leader, Salauddin Khan, submitted the

"No Xmas, 31st night celebrations in public places"

Staff Reporter :The Home Ministry has banned all celebrations of Christmas and 31st night in public places in view of the 11th parliamentary election to be held on December

1st Black Democratic nominee for Florida governor gives up race

AP, Tallahassee :Andrew Gillum, who tried to energize Florida's young and minority voters through a Democratic coalition seeking to end two decades of Republican control of the governor's office,

PEC, Ebtedayee exams begin

PEC, Ebtedayee exams begin

Staff Reporter :The Primary Education Completion (PEC) and Ebtedayee Examinations for the fifth graders began across the country on Sunday.The two and a half hour-long tests started at 10:30