The study warns that the search for alien life could be marred by the fear of 'false positives'.

What is at stake: Missing real signs of life could misdirect research priorities and risk destroying undiscovered ecosystems through resource exploitation. Why it happens: False negatives may arise ...

Earth’s earliest microbes may have built vital chemistry around molybdenum, a metal thought too scarce to matter in ancient ...

The first batch of files was made public on 8 May under the orders of the US President. He is the latest president to release ...

The Department of War has published its second release of declassified Unidentified Anomalous Phenomena files under the ...