For the last few decades NASA has been leaving few stones on the surface of Mars unturned—quite literally in some cases—in the search for extraterrestrial life within our own Solar System. But now an international team of researchers has found what may be a biosignature in the atmosphere of theread more

The solar system appears to have been traveling through the molecular remnants of ancient supernovae for the past 33,000 years, at least according to the presence of a rare type of iron that shouldn’t even exist on Earth. Born in the fiery collapse of massive stars as they explode into supernovae,read more