Traces of life on Martian surface may have been bleached away

London, February 19 (ANI): A Martian meteorite found in Antarctic ice suggests that the surface of the Red Planet is riddled with chemicals related to those used in household bleach.

This supports the idea that carbon-bearing compounds - strong indicators of life - may have been broken down by chemical reactions, suggesting that scientists need to dig deeper into Mars to search for traces of any past inhabitants.

"We're speculating that you perhaps cannot find organics on the surface of Mars. You have to be below the surface or inside sedimentary rocks," New Scientist quoted Sam Kounaves of Tufts University in Medford, Massachusetts as saying.

Kounaves and colleagues studied a Martian meteorite called EETA 79001, collected in 1979 in Antartica where it fell 12,000 years ago.

When the team cut it open to study the stuff inside, they found a white substance nestled in the meteorite that turned out to contain a form of nitrate, a chemical that some earthly bacteria use as fuel.

By comparing the ratio of isotopes found in it with those on Earth, the team determined it's Martian not a contaminant, Kounaves told New Scientist at a meeting of the American Association for the Advancement of Science in Boston, Massachusetts, last week.

The team also found small amounts of chloride minerals in the rock, and are confident these are from Mars.

The Phoenix Mars lander had earlier found related compounds called perchlorates, which can also be fuel for microorganisms, in Martian soil.

Chemical reactions can produce perchlorates from chlorides, but an intermediate step is the formation of oxychlorines - a class of highly oxidising chemicals that includes household bleach.

Then ultraviolet light from the sun and cosmic rays can convert perchlorates back into oxychlorines. When these bleaching agents contact even a little bit of water, they will break down any organic compounds present.

The finding suggests that NASA's Curiosity rover have to drill beneath the Martian surface to find traces of past life.

Good news is Curiosity has brought along a drill.

Although it can only get 6.4 centimetres deep, scientists say it may be enough to find any organics preserved in rocks below, shielded from the oxychlorine-forming processes. (ANI)

Matches

MORE TOP STORIES TODAY

Rajasthan edge low-scoring thriller

Rajasthan edge low-scoring thriller

The bowlers restricted Hyderabad to 133 for 6 before Rahane and Binny took Rajasthan over the line. More »

Maxwell blitz takes Punjab home

Maxwell blitz takes Punjab home

The Kings XI batsman blasted a 43-ball 95 to help his team pull off a massive chase against Chennai Super Kings. More »

Bangalore vs Mumbai: A battle of the big-hitters

Bangalore vs Mumbai: A battle of the big-hitters

As two of the most glamorous sides in the Indian T20 league, the focus of the match between Mumbai and Bangalore will invariably be on the middle-order… More »

BCCI lacks leaders to take on Srinivasan, says Manohar

BCCI lacks leaders to take on Srinivasan, says Manohar

Two former BCCI presidents, Shashank Manohar and Jagmohan Dalmiya, have reacted strongly to the news of the BCCI calling an emergent meeting on Sunday… More »

Pietersen ridicules idea of day-night Tests

Pietersen ridicules idea of day-night Tests

Kevin Pietersen has ridiculed the idea of day-night Test cricket, saying the game would be so different to proper Test cricket that we will need a whole… More »

Beleaguered Yuvraj tees off to Sharjah's delight

Beleaguered Yuvraj tees off to Sharjah's delight

Yuvraj Singh was hardly convincing to begin with against Delhi, but a big dose of crowd support and a helping of poor bowling meant he had the opportunity… More »

Stressed Trott stands down again

Stressed Trott stands down again

The England and Wales Cricket Board (ECB) on Friday confirmed that batsman Jonathan Trott is to take another break from all cricket with immediate eff… More »

PCB starts another coach hunt

PCB starts another coach hunt

The PCB has decided to not extend the contracts of head coach Moin Khan, fielding coach Shoaib Mohammad and batting consultant Zaheer Abbas, and has invited… More »

Pakistan cricketers face probe

Pakistan cricketers face probe

Pakistani cricket authorities have launched an investigation after a number of current international stars played in exhibition matches in the United States… More »

Fiery star Stokes bids to curb his temper

Fiery star Stokes bids to curb his temper

England all-rounder Ben Stokes admits he must keep his anger under control if he is to end his international exile. More »

Bangalore's arsenal blazes to victory

Bangalore's arsenal blazes to victory

Yuvraj Singh was back to his best in his first match for Royal Challengers Bangalore. More »

BCCI to meet before next court hearing

BCCI to meet before next court hearing

The BCCI will hold an emergent working committee meeting on April 20 to discuss the future course of action with regard to the Supreme Court hearing concerning… More »

Gavaskar wants a clean IPL

Gavaskar wants a clean IPL

"Integrity is non-negotiable..." says the BCCI's interim chief ahead of Season 7 of the tainted league. More »

Time for Chennai to enter familiar cocoon

Time for Chennai to enter familiar cocoon

Chennai have an emphatic 8-3 lead in the head-to-head with Punjab, with one game tied More »

Kallis, Narine star in KKR win

Kallis, Narine star in KKR win

An all-round display saw Knight Riders thump Mumbai Indians by 41 runs in the IPL-7 opener. More »

'Yak' Kallis still on top of his game

'Yak' Kallis still on top of his game

The 38-year-old South African veteran turned it on for Kolkata Knight RIders in the opening match of IPL-7. More »

Rajasthan and Hyderabad face-off

Rajasthan and Hyderabad face-off

A quality that defines Rajasthan and Hyderabad is consistency. Rajasthan was one among two teams to enjoy complete dominance at home last season. Hyderabad… More »

Srinivasan named in fixing report: SC

Srinivasan named in fixing report: SC

The court emphasised that the tainted administrator can no longer work for the BCCI. More »

Yuvraj happy to play for RCB: Kohli

Yuvraj happy to play for RCB: Kohli

New-look RCB will play their first game of IPL-7 on Thursday. More »

IPL: News Line

IPL: News Line

A round-up of all the news from this season of the IPL. More »

Shane Watson issues moral warning

Shane Watson issues moral warning

'Everyone knows what is right and what is wrong and if you do the wrong thing it will be found out' More »

Why I'm not looking forward to the IPL

Why I'm not looking forward to the IPL

Welcome to another season of a league that many watch but few trust. More »

Johnson may quit T20s for Tests

Johnson may quit T20s for Tests

Australia's Mitchell Johnson may quit limited-overs cricket to prolong his test career with an eye on the 2015 Ashes series in England, the fast bowler… More »

Nepal players call off boycott

Nepal players call off boycott

Thaw in relations after formation of an advisory committee that would work in tandem with the Cricket Association of Nepal. More »