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Scooped by L. Charles Burch onto MN News Hound |
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It's becoming clear that the planet was once a wet world with features that were very Earth-like. For example, NASA's recently landed Mars Science Laboratory rover Curiosity touched down on an ancient riverbed inside Gale Crater where water, perhaps two feet deep, used to flow. Evidence of clays near Mars Exploration Rover Opportunity are also evidence that minerals have interacted with surface water some time in the past.
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New observations by NASA's Hubble Space Telescope are expanding astronomers' understanding of the ways in which galaxies continuously recycle immense volumes of hydrogen gas and heavy elements. This process allows galaxies to build successive generations of stars stretching over billions of years. This ongoing recycling keeps some galaxies from emptying their "fuel tanks" and stretches their star-forming epoch to over 10 billion years. Via Sakis Koukouvis Delete the scoop?
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