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An image tweeted by an astronaut on the International Space Station has been greeted with excitement - as it appears to show a UFO in the sky.

The picture was shared by US astronaut Scott Kelly, who has been in space for 236 days out of a year in orbit.

And its intriguing content has spoken to alien believers, who feel the 51-year-old is "trying to tell the world about the existence of aliens".

The image was shared on Kelly's Twitter account on Sunday with the caption: "Day 233. Once upon a #star over Southern India. #GoodNight from @space_station! #YearInSpace."

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But while the world from 155 miles is a breathtaking sight, it's something in the top right of the image which has intrigued UFO spotters.

YouTube channel Sonofmabarker posted a video stating: "Last night aboard the Space Station astronaut Scott Kelly tweeted this photo.

"It was taken while the ISS was over India.

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"In the upper right of the photo you can clearly see a large object with two lights on each end.

"It also appears to be very large and constructed.

"I would find it hard to believe that Scott Kelly did not notice this when he tweeted this out.

"It really sticks out like a sore thumb.

"Scott Kelly thank you for sending this photo down to Earth.

"Hardly a week goes by without someone from the ISS sending us a photo or video that really is quite strange and it is left for us to decide."

Those who feel that extra terrestrials' existence is being hidden by Nasa and other space agencies slavishly follow the ISS live feed streamed on the Nasa website and regularly suggest that there are strange UFOs which appear to be "monitoring the space station".

(Image: @StationCDRKelly/Twitter)

Scott C waring, editor of blog site UFOsightingsdaily.com, told the Express: "When an astronaut tweets a photo of a UFO, you can bet people notice it.

"Scott Kelly likes to send out photos of the view from the windows of the space station, and they look cool.

"This one however has a cigar shaped glowing UFO with a metallic body in it.

"The UFO is about 25 meters long and 150 to 200 meters away.

"It looks like Scott was trying to hint at the existence of aliens. Message received Scott, and thanks."

(Image: Reuters)

In a climate where so many suggestions of UFOs are made, Nasa doesn't comment on individual cases, so it remains up to individuals whether they believe the truth really is out there.

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