An optimistic calculation suggests the reason we haven't heard from aliens yet is because humans haven't been around for long enough.
Space missions could also carry "bacterial invaders" to unspoiled alien worlds such as Mars and the moon.
New research suggests that China's FAST telescope could spot self-replicating extraterrestrial technology at the outskirts of the Milky Way.
NASA Administrator Bill Nelson described the rover sampling the first core sample ever drilled from an alien world as a "momentous achievement."
The star system contains at least three planets that supposedly lie in a region known as the habitable zone.
Researchers who have observed the planet using the James Clerk Maxwell Telescope (JCMT) in Hawaii, believe there is evidence to suggest alien life may exist on Venus.
Researchers say determining intelligence across the galaxy could give clues to our own fate.
"There is a reasonable chance that the planet hosts a large ocean underneath the atmosphere at pressures and temperatures similar to those in the Earth's oceans," researcher Nikku Madhusudhan said.
"'Are we alone?' is one of the biggest unanswered questions," said study first author Howard Chen.
Human's evolved through a series of highly unlikely events—so finding another intelligence like us would be like winning the lottery many times over.
"In the search for life beyond our solar system, the most promising planets might not be Earth twins," says geochemist Stephanie Olson.
Nieves penitentes on Earth's second highest volcano could offer insight in the search for extraterrestrial life.
Breakthrough Listen is a program designed to search for evidence of alien life by scouring the the skies for distant radio signals.
Build-ups of toxic gases in the atmospheres of many exoplanets in the "habitable zone" could limit the "safe zone" in which life outside our solar system could actually exist.
NASA's James Webb Telescope will open up an entirely new avenue for searching for extraterrestrial life.
The exoplanet orbits a star that sits just six light-years away from Earth.
"Our work is calling for a complete revision for how we think about the potential for life on Mars."
Scientists think life might survive on Proxima b, in spite of powerful lashings from its host star.
The planets could have similar light and temperature conditions to those that may have existed when life first emerged on Earth.
If it's anything like the lake beneath the ice of Antarctica, it might just harbor life.
UFO skepticism has become something of a religion with an agenda.
A stable climate could be key to hosting life.
The moon contains the key requirements for life.