Scientists believe that these new worlds lie in the 'Goldilocks zone' of their respective solar systems.
A new proposal has been put forward to send a spacecraft to look for signs of alien life on Europa.
A large terrestrial planet located 40 light years away could be the perfect place to search for ET.
The space agency has discovered all the crucial ingredients for life in the oceans of Saturn's icy moon.
A new paper has suggested using a lottery and savings bond as a way to fund the search for alien life.
Britain's wartime Prime Minister wrote many articles long before ever stepping foot in Downing Street.
Scientists are hoping to develop a mission to learn once and for all whether there is life on Europa.
Scientists have developed a new testing method to aid in the hunt for extraterrestrial life forms.
Astronomers believe that a planet 14 light years away may be a promising place to look for alien life.
The Very Large Telescope (VLT) in Chile will soon be seeking out habitable worlds around Alpha Centauri.
Extrasolar planets may not be the only place where it is possible to find signs of extraterrestrial life.
Scientists believe that a nearby extrasolar planet is 'likely' to be capable of supporting alien life.
Scientists have identified two distant worlds which could be ideal places to look for alien life.
Mysterious silica formations photographed in a Martian crater could represent evidence of alien life.
Even if we do find a habitable planet, could its indigenous life forms have already died out long ago ?
A potentially habitable terrestrial planet has been discovered in the relatively nearby Wolf 1061 system.
Charles Bolden has commented on what would happen if NASA encountered an extraterrestrial life form.
NASA's Cassini spacecraft is set to embark on its closest and most daring flyby of the moon to date.
A new international poll has revealed that most people believe that there is alien life in the universe.
Astrobiologists have suggested that comet 67P may be home to live extraterrestrial micro-organisms.