Apollo 14 astronaut Edgar Mitchell believes that visitors from space may have prevented armageddon.
Professor Matthew Bailes has advised against attempting to correspond with an extraterrestrial race.
A new $100 million endeavor has been launched to look for signs of intelligent extraterrestrial life.
Astrobiologists have suggested that comet 67P may be home to live extraterrestrial micro-organisms.
Some scientists believe that life is likely to develop elsewhere in much the same way as it has on Earth.
Charles Bolden made the light-hearted remarks after being questioned by a ten-year-old on Sky News.
Astronomer royal Martin Rees believes that we are likely to encounter machine-based extraterrestrials.
The space agency has formed a new coalition of scientists from a wide range of different fields.
Chief scientist Ellen Stofan stated that we are likely to find evidence of alien life within 20 years.
Cosmologist Fergus Simpson believes that intelligent extraterrestrials would be much larger than we are.
SETI director Seth Shostak believes that we should broadcast the entire Internet in to the cosmos.
First picked up in 2001, these so-called 'fast radio bursts' are continuing to perplex scientists.
Could an alien civilization build a large spherical energy-harvesting structure around a distant star ?
The search for extraterrestrial life could be helped along by seeking out cosmic science experiments.
The legendary astronomer believes that it would be 'silly' to try sending messages in to space.
A controversial new claim suggests that evidence of 'directed panspermia' has been found by scientists.
Astronomers are planning to send radio messages to Earth-like worlds within a range of 20 light years.
Astrobiologists believe that they have found evidence of alien life in our planet's atmosphere.
So-called 'starivores' could be the ideal target for astronomers seeking signs of extraterrestrial life.
A geobiologist has identified structures on Mars that she believes were created by microbial life.