A 'cannonball' on Mars has UFO hunters excited

Mars is apparently fully inhospitable now but based on certain images, some think it was quite different in the past.

One alien hunter says the 'cannonball' is evidence of a war that ultimately ended life on Mars.

However, NASA says the ball is a rock that has turned round following a natural process. Find out more in the video above.

SEE ALSO: UFO spotted in sky moments before motorway crash

SEE ALSO: Is this evidence of an alien civilisation on Mars?

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Where to go to spot a UFO
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Where to go to spot a UFO
Mysterious booming noises and seething balls of light have been spotted above Cradle Hill by visitors scouring the sky for flying saucers. Some say they are attracted by nearby mystical sites such as Stonehenge, sceptics point to the military training grounds on Salisbury Plain. Recently released UFO government files contain flying saucer sightings since the 1950s. For mor info, go to nationalarchives.gov.uk/ufos.
With more than 300 UFO sightings reported every year, this sleepy town is believed to be the world's number one UFO hotspot. It lies at the heart of an area known to UFO enthusiasts as the Falkirk triangle, which stretches between Stirling, Fife and the outskirts of Edinburgh. Visit scotland.org for more.
Alien spaceships and odd sightings have been so regularly spotted on the Black Sea coast that UFO watchers claim that the city could be a galactic hub for aliens. Some people believe that Bytkha Mountain in the area could be a UFO base and one local claims to have taken many photographs.
he Northern Territories claims to have had more UFO sightings than anywhere else in Australia. Unexplained grey and black discs of all shapes and sizes and white and orange lights have been spotted undertaking spectacular manoeuvres as they zip around the skies. Outside Darwin City is the best place to spot them. Visit ufoterritory.com.au.
One of the biggest mass UFO sightings took place during the Stephenville lights incident in 2008 - and sightings have continued. Dozens of people reported seeing a large silent object with red glowing lights flying at high speed in the skies over Stephenville. Some claimed the object was a mile long.
A UFO mecca, thousands of enthusiasts descend on this town to enjoy its four-day Roswell UFO Festival, complete with alien costume competition. The town shot to fame in 1947 when debris from an alleged flying saucer was collected at an army air field. The UFO museum contains research documents and newspaper articles on the incident. Visit roswellufomuseum.com
Radio telescope antennas of the ALMA (Atacama Large Millimeter/submillimeter Array) project, in the Chajnantor plateau, Atacama desert, some 1500 km north of Santiago, on March 12,2013. The ALMA, an international partnership project of Europe, North America and East Asia with the cooperation of Chile, is presently the largest astronomical project in the world. On Wednesday March 13 will be opened 59 high precision antennas, located at 5000 of altitude in the extremely arid Atacama desert. AFP PHOTO/Martin BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
Known as the UFO capital of the world, the Extraterrestrial Highway is claimed to have more alien and UFO sightings each year than anywhere else. Strangely shaped flying objects and unexplained lights have been reported on the State Route 375 in Sand Spring Valley near Rachel, although non believers attribute them to the Air Force testing base Area 51 nearby.
New Age hippies say that aliens are attracted to this UFO hotspot by the energy emitted by natural earth vortexes in the region. Drawn by its incredible red rock formations, visitors to this spiritual mecca claim to have witnessed amazing celestial displays, frequent UFO sightings and paranormal experiences.
Unidentified orb lights, thought to be flying saucers, were seen by thousands of people over the skies of Phoenix in 1997. The mass sighting became known as the Phoenix Lights. Fresh sightings in 2007 and 2008 were discounted by the military as flares dropped by fighter aircraft.
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