Mars just dropped a surprise golden nugget —literally. Curiosity accidentally cracked open an ordinary-looking rock, only to ...

A rock on Mars spilled a surprising yellow treasure after Curiosity accidentally cracked through its unremarkable exterior.

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Astronomers have discovered that sulfur may be a key to helping us narrow down our search for life on other planets. It's not that sulfur is a great indication that a planet is inhabited.

The iron isn't pure—scientists believe it contains sulfur and nickel ... Many people think of this as lava, but it's actually rock. The rock is so hot, however, that it flows under pressure ...