Radio waves are fast, but not fast enough to reach us before a civilization goes extinct.
If we keep making satellites at the current rate, nearby planets could spot us by 2200.
Michio Kaku believes some of us might live to see the day that aliens finally make contact.
The state is welcoming all aliens and alien-seekers with a fresh itinerary.
The video went viral on Thursday.
There is indeed evidence of an ancient ocean on Mars, but seashells and a sphinx? Not so much.
No one and nothing was safe this year.
The SpaceX founder joked with confused Twitter users saying his Falcon 9 rocket was a nuclear alien UFO from North Korea.
Neil deGrasse Tyson doesn't give an F about all this UFO talk.
Metalworkers in the ancient world would hunt for iron from meteorites to create rare weapons and artefacts.
The former Blink-182 star is getting renewed attention after revelations of the Pentagon's UFO research program.
The Defense Department investigated reports of everything from "glowing auras" to unidentified flying objects.
The discovery opens up the tantalizing possibility that on other planets, life forms that need only atmospheric gas to survive exist, too.
A key version of an element could be a sign of life elsewhere.
NASA already explained the "concretion" phenomenon when a similar image made the rounds in 2014.