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- New images confirm presence of 'hydrated salts' in gullies running down Martian mountains
- But there is as yet no suggestion that Nasa is close to finding signs of lifeforms on the planet
The full details and implications of the findings to be set out in a press conference
The actual event will get underway at 4.30pm UK time, though details of the announcement are set to be revealed before that
Speculation has been rife ahead of Monday's announcement
Nasa has said it has solved a "Mars mystery"
Conjecture over US space agency's planned announcement focuses on possibility of water on the Red Planet
Despite Nigel Farage's prediction that the UK Independence party will cause an “earthquake” in British politics at the European Parliament elections, Britons give Ukip as much chance of winning as finding life on Mars.
Tombs: this weird restaurant in Ahmedabad, India is famous for its milk tea and the tombs between the tables. The owner, who claims to have opened the restaurant 40 years ago, says he does not know who is buried there.
International Olympic Committee and Fifa are about to embark on a prolonged period of instability, with their flagship events lined up in a frightening domino effect of uncertainty
Whittled down from 200,000 applicants, meet three of the intrepid Brits hoping to take that giant leap for mankind
The project hopes to establish human life on Mars by 2025, with the 'rigorous' selection process set to begin this year, but many hurdles remain in place
As China eyes a manned mission to the Moon, Nasa’s Curiosity has found proof that there was once water – and thus potentially simple life – on the Red Planet
Newly analysed data showed the temperature plunged to -93.2C (-135.8F) in August 2010
Red Planet had at least one large freshwater lake with right sort of chemical make-up to support kind of mineral-eating microbes seen on Earth
Since the US shelved its space programme in the aftermath of the 2008 crash, China has forged ahead, says Steve Connor
New research shows distinctive rock is more than twice as old as previously thought – and could expose signs of ancient Martian life