Who should go to Mars? and other top stories.

• Who should go to Mars?

  

  Elon Musk laid out his plan to colonize Mars at a conference on Tuesday, but it was during the Q&A session that a woman asked one of the key questions: who will be chosen to embark on a risky trip to colonize a harsh planet? “If normal people want to travel to Mars, do we need some specific requirements?” she asked. “Can normal people go?" The SpaceX CEO had two answers to this line of questioning. "We're trying to make it such that anyone can go,” he said, with "maybe a few days of training.”..

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• The United Nations Is Launching A Space Mission

  

  Enlarge this image A model of the planned Dream Chaser mini-shuttle designed by Sierra Nevada Corp. is displayed in March 2014 for a news conference at NASA's Michoud Assembly Facility in New Orleans. Janet McConnaughey/AP hide caption toggle caption Janet McConnaughey/AP A model of the planned Dream Chaser mini-shuttle de..

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• Did NASA just change your zodiac sign?

  

  Mary Schwalm for The Boston Globe Keri Califano of Boston said that seeing her zodiac sign switched to Capricorn is motivation to have her Aquarius tattoo removed after two decades. It seemed like a good idea at the time. On a trip to Florida a few years back, Lorinda Gevry had her zodiac sign, Gemini, tattooed on her ankle. She’d always taken an interest in the cosmos, and the personality traits said to be associated with Gemini -- artistic, fun, multifaceted -- seemed to fit Gevry perfe..

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• Did Mars's crust contribute to its atmosphere?

  

  Mars’s famously red surface is more than just a passive bystander to the dramatic changes that have occurred on the planet over time – instead, it likely influenced them, according to a new study by NASA researchers.The study’s findings were made possible by the Curiosity rover’s information gathering Sample Analysis at Mars (SAM) array of instruments, which measured the levels of the gases xenon and krypton in the Red Planet's atmosphere. By tracking those gases, scientists say, they can also ..

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• Reservoirs play substantial role in global warming

  

  A recent photo of a reservoir on the Snake River in Washington. Credit: Shelly Hanks, WSU Photo Services. Washington State University researchers say the world's reservoirs are an underappreciated source of greenhouse gases, producing the equivalent of ...

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