Looking for molecular evidence of life on other worlds is tricky, but a test based on the reactivity of carbon compounds ...

President Trump said he's directing the Pentagon and other federal agencies to identify and release files related to UFOs and extraterrestrial life.

It is a piece of chemistry born light years away, a rogue iceberg of cosmic material that pre-dates our own Sun. And for a brief, glorious period, it has been sailing through our celestial ...