NASA released an image this week showing strange piles of boulders on Mars.
The image was originally meant to track the movement of sand dunes near the North Pole on the planet, but what’s on the ground between the dunes caught the attention of scientists studying it.
“What organized these boulders into neatly-spaced piles? In the Arctic back on Earth, rocks can be organized by a process called ‘frost heave,'” the agency stated in a blog post.
“With frost heave, repeatedly freezing and thawing of the ground can bring rocks to the surface and organize them into piles, stripes, or even circles. On Earth, one of these temperature cycles takes a year, but on Mars it might be connected to changes in the planet’s orbit around the Sun that take much longer.”
Video Credit: GeoBeats