Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. About 3.8 billion ...

But some scientists believe only ice – thought to be preserved deep in craters on the moon’s far side – could potentially support future lunar missions as a water source for astronauts.

Ronald Wilson Reagan was born on this day in 1911. His legacy still shapes American politics, historians say, and he's a guiding force for Republicans as they control the White House, House and ...

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