Alien hunters claim to have spotted a stone circle in images (pictured left and top right) sent back by the HiRise camera on the Mars Reconnaissance Orbiter, which they claim resembles Stonehenge (bottom right) in Wiltshire, England. However, experts have warned that stone circles can also form naturally in permafrost that regularly thaws and defrosts. It is the latest in a long line of strange 'objects' spotted in images sent back from Mars.
The aircraft and its twin condensation trails were spotted just above the Great Exuma Island in the Bahamas.
The astonishing photos (selection pictured) were captured using backyard telescopes, robots and even an iPad at 37,000 feet.
How to watch the SUPERMOON eclipse: Rare phenomenon will be seen throughout most of the world this weekend (and some say it could spell the end of the world)
Sunday's supermoon eclipse will last 1 hour and 11 minutes, and will be visible to North and South America, Europe, Africa, and parts of West Asia and the eastern Pacific. Weather permitting, you can see the supermoon after nightfall, and the eclipse will cast it into shadow beginning at 8:11pm ET (1.11am BST). The moon will then spend just over an hour passing into the shadows, with the last sighting of it at 10:11 ET (3:11 BST). The inset image shows where the event will occur.
Apple's iPhone 6s hits the high street: First customers - including a ROBOT - get their hands on the next-generation device
Stores across Australia were the first to start selling the iPhone 6s and 6s Plus (Sydney top left), followed by the UK (London top centre), China (Changdu City top right), France (Paris pictured bottom left), Germany (Munich bottom centre) and Japan (Tokyo pictured bottom right). The phone goes on sale at 8am in the respective time zones. In Sydney, a woman used a robot to queue in her place so she could carry on working and not have to camp out in the rain.
- Haunting solar eclipses, speeding comets and distant worlds: Stunning winners of Astronomy Photographer of the Year revealed
- Monster supermassive black hole at centre of distant galaxy is 30 times bigger than it should be... and is outgrowing its host
- The grisly riddle of the 9,000-year-old decapitation: Skull found with amputated hands had its flesh removed during ancient ritual
- The glider that plans to hitch a ride to the edge of SPACE using nothing but polar air currents and 'stratospheric mountain waves'
- Stonehenge-style rocks spotted on MARS: Bizarre circular stone formation on the red planet resembles the iconic Pagan site
- Do YOU believe in aliens? Poll shows Germans are the strongest supporters, the UK is most skeptical and right-wingers think governments are hiding the truth
- 'Johnny Five' will keep soldiers alive: US Army hopes to use Short Circuit-style robots to rescue casualties from battlefields
- The terrifying cockroach robo-SPY that could soon perform reconnaissance missions for the Russian military
- The coolest boat in the world: New 328ft superyacht can break through polar ice and visit the globe's most remote destinations
- Have YOU ever tracked your partner online? Half of us believe it's acceptable to use phones to spy on loved ones
- The ultimate laser cannon: 'Gatling gun' can focus multiple beams to create super powerful weapons
- Apple's iPhone 6s hits the high street: First customers - including a ROBOT - get their hands on the next-generation device
- How ‘unfriending’ someone on Facebook is now workplace bullying: Fair Work Commission rules social media snub was 'unreasonable and emotionally immature'
- Millions of mobile phone users face higher monthly bills after Ofcom TREBLES the fee for using 3G and 4G networks
- The ultimate party phone: Free AmpMe app lets users link handsets to play music together as one giant speaker
- Elon Musk creates the world’s most exclusive school: Entrepreneur reveals he bought a mansion to house 15 pupils (including his five kids) and three teachers
- 'The world is over': Facebook users panic after site goes down for just 12 MINUTES
- Stonehenge-style rocks spotted on MARS: Bizarre circular stone formation on the red planet resembles the iconic Pagan site
- Nirvana's Smells like Teen Spirit is the most iconic song EVER: Computer analysis reveals the track ticks all the boxes needed to be a hit
- How to watch the SUPERMOON eclipse: Rare phenomenon will be seen throughout most of the world this weekend (and some say it could spell the end of the world)
- Elon Musk creates the world’s most exclusive school: Entrepreneur reveals he bought a mansion to house 15 pupils (including his five kids) and three teachers
- California's Giant Sequoias under threat from drought: Researchers say 3,000 year old trees showing signs of stress
- The ultimate laser cannon: 'Gatling gun' can focus multiple beams to create super powerful weapons
- What has happened to the hurricanes? Forecasters say NO severe storms have hit western Atlantic this year for the first time since 1914
- Parched America: Satellite images reveal just how dry the ground has become across California, Oregon and Washington
- Department of Homeland Security to create 'brain chip' phone to constantly monitor users and SELF DESTRUCT if an unauthorised person tampers with it
- Why you should NEVER stalk your ex on Facebook: Behaviour creates a vicious cycle where the site is used to help cope with a breakup but actually makes it worse
- The grisly riddle of the 9,000-year-old decapitation: Skull found with amputated hands had its flesh removed during ancient ritual
- The SNAKE on Pluto: High-resolution colour images from New Horizons reveal strange 'animal skin' terrain on the dwarf planet
- Radar to search for Queen Nefertiti: Egypt gives go ahead to look behind King Tutankhamun's tomb to try and find grave of woman who may have been his mother
- 'The world is over': Facebook users panic after site goes down for just 12 MINUTES
- Monster supermassive black hole at centre of distant galaxy is 30 times bigger than it should be... and is outgrowing its host
- Seeing supersonic: Nasa captures stunning images of shock waves created by jet fighters as they break the sound barrier
- What to do when your boyfriend blasts into space for a YEAR: Instagram snaps reveal how astronaut Scott Kelly keeps in touch with his girlfriend on Earth
- MOST READ IN DETAIL
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The SNAKE on Pluto: High-resolution colour images from New Horizons reveal strange 'animal skin' terrain on the dwarf planet
Scientists aren't sure what causes the pattern, but theories include the impact of plate tectonics rippling the surface, or frozen gasses that are released when surface temperatures increase. The 'snakeskin' image of Pluto's surface (left) is just one tantalising piece of data New Horizons sent back in recent days. The spacecraft also captured the highest-resolution colour view yet of Pluto (top right), as well as detailed spectral maps. They reveal features that resemble dunes, the older shoreline of a shrinking glacial ice lake, and fractured, angular water ice mountains (bottom right) with sheer cliffs.
Has the mystery of the Mona Lisa been solved? Experts believe they have found the body of the noblewoman who sat for Da Vinci's masterpiece
Historians believe they've found Leonardo's model (inset) buried under the altar of a derelict Florence convent (pictured). The bones found date to the time of death of Italian noblewoman Lisa Gherardini del Giocondo, widely believed to be the model posing in the world famous painting. In an investigation worthy of the Da Vinci Code, archaeologists led by art detective Silvano Vinceti exhumed several skeletons stacked on top of each other under the chapel. And scientists have now completed carbon dating work on one of the fragments which indicated the remains were compatible with the period.
The RV for the end of the world: 18-tonne, $890,000 vehicle that looks ideal for people who like holidaying outdoors - in a warzone
The massive RV, produced in Saalfelden am Steinernen Meer, Austria, has a 720-horsepower engine and comes with a $890,000 price tag. But despite its tank-like appearance, the Action Mobil Global XRS 7200 (left) - described as a 'motor home for global cruises' - is also built for comfort and comes with 23 sq ft of living space. Amenities prospective owners will get for their money include satellite television, a washer and dryer in a fully kitted-out kitchen (top right), and a lift at the back to carry a motorbike (bottom right).
Paralysed man walks... using power of the mind: Watch the incredible moment 'Modern miracle' sees brain waves harnessed to allow motorbike crash victim to move his legs
The man (pictured) - who is being treated by spinal injury experts at the University of California - has his thoughts intercepted in a cap on his head and sent wirelessly to stimulate his leg muscles. He lost the power of both legs after his spinal cord was completely severed in a motorcycle accident five years ago. He had months of training to re-learn to walk (left and top right), including physio-therapy to strengthen his muscles, and brain training, which involved playing a video game while wearing the cap (bottom right) and using his thoughts to control the movements of a character on screen. In a world first, the 26-year-old's brain waves have now successfully been harnessed to allow him to move his own legs.
The glider that plans to hitch a ride to the edge of SPACE using nothing but polar air currents and 'stratospheric mountain waves'
The Perlan II glider (pictured left) is the world's first engineless aircraft designed to reach altitudes of 90,000ft (27,430 metres) by riding so-called 'stratospheric mountain waves' (illustrated top right). Earlier this week, the glider (measurements pictured bottom right) made history by soaring to 5,000ft (1,525 metres) during its maiden flight over Roberts Field, the Redmond Municipal Airport in Oregon.
The grisly riddle of the 9,000-year-old decapitation: Skull found with amputated hands had its flesh removed during ancient ritual
Anthropologists discovered the decapitated skull with two hands placed over its face (pictured left) in a shallow pit in a cave in Lagoa Santa in east-central Brazil. A limestone slab had been placed over the pit suggesting it had been part of a ritual burial. Analysis of the remains suggested the remains belonged to a young man who was part of the local group of prehistoric hunter gatherers who lived in the cave (pictured bottom right). Cut marks on the bones suggest the head was forcibly removed and had its flesh cut off (illustrated in the graphic to right). The discovery may provide insights into the origins of decapitation practices used by native cultures in South and North America.
What to do when your boyfriend blasts into space for a YEAR: Instagram snaps reveal how astronaut Scott Kelly keeps in touch with his girlfriend on Earth
The images provide an insight into the lives of Scott Kelly, who is spending a year on the ISS, and his girlfriend Amiko Kauderer, who is in Texas, working as a public relations officer at Nasa. They include shots of Kelly and Kauderer's view of the beach (left); the pair practicing various skills (centre) - which involved juggling for Kelly and bouldering for Kauderer; and images of the couple at their work stations (right). Kauderer, who is a PR officer for Nasa, keeps a cardboard cutout of her boyfriend by her desk.
Seeing supersonic: Nasa captures stunning images of shock waves created by jet fighters as they break the sound barrier
Nasa scientists at the Armstrong Flight Research Centre in Edwards, California, have developed a new way of capturing images of the shock waves produced by supersonic aircraft (pictured). They adapted a 150-year old technique called Schlieren imagery, used to image flowing liquids, and hope it may aid the development of quieter supersonic aircraft.
Bloodhound SSC on tour! Supersonic car makes it world debut in London ahead of its 1,000mph record-breaking run
Bloodhound SSC is the centre-piece of a free exhibition in Canary Wharf which is expecting 8,000 visitors. The visitors will be among the first to see the completed 44ft (13.5-metre) jet-powered streamliner (pictured main), explore its high-tech cockpit and see its tail fin (pictured inset top left) in place for the first time. Bloodhound SSC will undergo UK runway testing up to 200 mph (321 km/h) at the Aerohub, Newquay later this year. It will then go to South Africa to begin high-speed testing with the target of reaching 1,000 mph (1,610 km/h) in 2017. The right-hand image shows the parachutes underneath the jet engine exhaust which are used to slow the racing car down.
The radical 'sliding seat' that could make boarding flights far faster
US company Molon Labe Designs claims that its 'Sider Seat' will save airlines two hours of extra flying time each day and result in 'happy, loyal customers'. The system works by enabling the outer seat to slide over the middle seat. This increases aisle width from 19 inches to 43 inches and allows passengers to move about more.
Lockheed Martin reveals the replacement for the iconic U-2 spy plane and says the TR-X WON'T require a pilot
Lockheed Martin this week revealed its Skunk Works proposal for a next-generation U-2 spy plane (inset), a tactical reconnaissance aircraft called 'TR-X' that can be flown as a drone if needed. the new craft will also be able to use laser weapons in the future and communicate directly with fighter jets.
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Fangs for the attention! Four new species of 'smiling' spiders give love bites to females they fancy
All around the world... and beyond
British photographers Fiona Rogers and Anup Shah captured apes in Indonesia and Borneo - and highlighted how human our evolutionary cousins are.