10
Scientists have calculated that it could be a long time indeed before we hear from intelligent aliens.
15
Three witnesses claimed to have encountered the entity around one week ago in the city of Santa Cruz.
75
A new study has suggested that the universe is likely to be teeming with extraterrestrial life forms.
17
A terrified couple in England have sketched a creature that they encountered while out driving at night.
25
The SETI Institute is aiming to find evidence of aliens in a place where nobody had thought to look.
50
A new study has suggested that it may be possible to stop alien civilizations from discovering us.
140
An unidentified US Navy officer claims that he saw evidence of UFOs at the Moffett Field naval base.
86
The US President commented on extraterrestrial contact during a television interview with a six-year-old.
38
Mysterious silica formations photographed in a Martian crater could represent evidence of alien life.
66
Even if we do find a habitable planet, could its indigenous life forms have already died out long ago ?
379
An astronomical anomaly thought by some to be an 'alien megastructure' has continued to defy explanation.
40
The famous 'Wow!' signal picked up in 1977 could turn out to have a rather mundane explanation.
9
The bizarrely named 'octopus stinkhorn' looks rather a lot like something from the Alien movie franchise.
22
A potentially habitable terrestrial planet has been discovered in the relatively nearby Wolf 1061 system.
27
Charles Bolden has commented on what would happen if NASA encountered an extraterrestrial life form.
32
Former police officer Alan Godfry had a close encounter with a UFO while on patrol back in November 1980.
17
The Indiegogo campaign aims to raise $50,000 to launch a satellite that will seek out alien visitors.
14
NASA's Cassini spacecraft is set to embark on its closest and most daring flyby of the moon to date.
379
Astronomers have been left puzzled by a star that appears to have an unexplained mass orbiting around it.
213
Professor Stephen Hawking has warned that hostile extraterrestrials could pose a threat to the Earth.