What would happen, then, should the first unquestionable indication of alien technology come in the form of a momentary flare, powerful enough to be observed, but too short to question? The ...

If you've been following exoplanet research over the last couple of years, you've definitely heard of K2-18b. Located 124 light years away in the constellation Leo, it's attracted a lot of attention ...

Documents might help scientists shed light on unexplained phenomena and government secrets, experts said.

The tunnel looked dark and lifeless at first. Then flashes of pale white darted through the water. One sweep of the net revealed tiny albino fish that looked almost unreal. It felt like discovering ...

Throughout Trump's remarks, ABC News live fact-checked some of the president's statements for exaggerations, falsehoods and points that need more context.

Tired of spam texts that just won't stop? Your phone comes with built-in protection, but it might be turned off by default. Here's how to fix that on both iPhone and Android.