All of the images in this gallery were taken by ISS astronaut Scott Kelly during a single pass over Australia. (Twitter/Scott Kelly)

Astronaut Scott Kelly is spending an entire year aboard the International Space Station, and he's seeing some things on our own planet that look extraterrestrial.

Over the past few days, he's been posting a series of 17 images to his Twitter page that he captured during a single pass over Australia. In these images, which you can view in the gallery at the top of this page, we can see landscapes that resemble other planets in our solar system, not Earth.

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Kelly has completed about seven of his 12 consecutive months in space, according to NBC News. His mission is part of a NASA study that includes his identical twin, Mark. The administration is studying them to see what impacts space will have on a person who spends an entire year away from Earth.

His 12 months in space will beat the previous American record for continuous time spent in orbit, but it won't come close to the record amongst all astronauts, USA Today noted. That record belongs to Russian cosmonaut Valery Polyakov, who spent 438 consecutive days in space, the report added.