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Photo: Cobalt88 / Getty Images Mars Wasn’t Always a Red Planet, It Used to Be Blue
The red planet had a massive ocean about 3 billion years ago, effectively making it blue, a lot like Earth is today.
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(Photo by Daniel Villeneuve / Getty Images) Did NASA Accidentally Kill Life on Mars?
A German astrobiologist is arguing that NASA introducing water to Mars to see if it attracted life probably did more harm than good.
