85
The dust storm that left the Opportunity rover out of commission is now classed as 'planet-encircling'.
5
The construction of the world-famous stone circle may have been all about bringing people together.
9
A crane operator working on a construction site has recorded footage of a 360-degree rainbow.
12
The space agency has released a new image of a peculiar circle on Mars - but what exactly is it ?
8
Ecologists believe that they may have finally solved the mystery behind Namibia's mysterious circles.
45
A huge alligator was filmed by tourists at the Circle B Bar Reserve in Polk County, Florida this week.
20
Thousands were left perplexed by the high-altitude aircraft which circled for about an hour on Wednesday.
9
These mysterious circular, grass-ringed patches are still leaving scientists scratching their heads.
5
Archaeologists have unearthed evidence of a huge circle of timber posts just two miles from Stonehenge.
67
Professor Richard Taylor has called for a renewed effort to understand how crop circles are formed.
14
Strange circular, grass-ringed patches have been discovered over hundreds of square kilometers.
5
A huge flightless bird called Gastornis is thought to have once roamed what is now the Arctic Circle.
6
Phobos, one of the two small moons of Mars, could eventually break apart and encircle the planet.
26
A former RAF engineer claims that MI5 hired crop circle hoaxers to discredit the UFO phenomenon.
2
Archaeologists have uncovered a hidden stone monument situated just two miles from Stonehenge.
8
New aerial footage has been released showing an intricate pattern of circles in a field in Russia.
19
A previously undiscovered stone circle has been unearthed by archaeologists in southern England.
51
A woman who had been filming the eruption also recorded an object that had appeared in the sky nearby.
47
A new theory has proposed that the prehistoric stone circle may have supported a large wooden altar.
15
The mysterious patterns were once believed to be secret codes designed to guide German bombers.