Cartoon depiction of the sulfur cycle in different planetary regimes. In Earth-like case (A), atmospheric SO 2 is scrubbed from the atmosphere by wet deposition. In the Venus-like case with high ...

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.

Credit: Pablo Carlos Budassi/Stocktrek Images/Getty Images 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 ...