Astrophysicist Neil deGrasse Tyson, 67, explained how any alien visitor from another planet would likely look very different ...

Donald Trump's declassified UFO files and the documentary Sleeping Dog reignite the debate on extraterrestrial life, yet officials maintain no evidence confirms alien existence.

3I/ATLAS, a mysterious interstellar object racing toward the Sun, is baffling scientists with its speed and origin. Some researchers suggest it could even be alien-made, drawing comparisons to probes ...