A new theory suggests that an intelligent alien civilization may try to collect and store stars for energy.
Could there have been an advanced civilization on our planet long before mankind appeared on the scene ?
Dr. Michio Kaku maintains that contact with an alien civilization will happen before the century is out.
The ancient Indus civilization had a novel solution to the lack of flowing water near its many villages.
Astronomers are hoping to one day establish contact with an advanced extraterrestrial civilization.
Planetary scientist Alan Stern has suggested that some civilizations may live below a planet's surface.
Scientists have come up with a way to scan the skies for pulses of light from an alien civilization.
An ancient civilization is believed to have built standing stones in the rainforest over 1,000 years ago.
Two Canadian astronomers have found possible signs that an alien civilization is trying to communicate.
Professor Brian Cox maintains that advanced extraterrestrial civilizations may inevitably self-destruct.
A new study has suggested that the universe is likely to be teeming with extraterrestrial life forms.
Researchers have managed to solve two mysteries pertaining to Peru's enigmatic Nazca civilization.
The huge sphere, which measures around 5ft across, is thought to be evidence of an ancient civilization.
A new study has suggested that it may be possible to stop alien civilizations from discovering us.
Scientists believe that globular clusters may be a good place to look for extraterrestrial civilizations.
Author Graham Hancock claims that he has found new evidence to support his controversial theory.
Stephen Hawking believes that intelligent robots could be on course to destroy human civilization.
Could an alien civilization build a large spherical energy-harvesting structure around a distant star ?
Further evidence has been found suggesting that drought caused the collapse of the Mayan civilization.
Archaeologists have long pondered over the strange disappearance of the ancient Sanxingdu civilization.