article_snippet: Thanks to missions like Nasa's Curiosity rover
article_snippet: Nasa scientists in Maryland found that 3.7 billion years ago 3.7 billion years had more than the Arctic Ocean.
article_snippet: The research was carried out using two telescopes at the Keck Observatory on Hawaii and the European Southern Observatory’s Very Large Telescope in Chile.
article_snippet: even more water, some of which may have been deposited below the surface may also prove to be useful in the search for underground water.
highlights_snippet: Nasa Goddard scientists in Maryland found that 3.7 billion years ago 3.7 billion years had more than the Arctic Ocean .
  
highlights_snippet: This is 'longer than the period of time needed for life to develop on Earth' 