Rolling Stones

Back in the 1970s, NASA’s Mariner and Viking Missions were sent out to explore
other planets in our Solar System. All three of them (there were two Viking
missions) captured images of Mars’ moon Phobos during their travels. They were
our first images of the tiny, potato-shaped moon, and the images held a mystery:
strange linear grooves on the moon’s surface. There’s been a debate about what
caused these grooves.....
58348
https://www.universetoday.com/140593/st ... s-surface/
other planets in our Solar System. All three of them (there were two Viking
missions) captured images of Mars’ moon Phobos during their travels. They were
our first images of the tiny, potato-shaped moon, and the images held a mystery:
strange linear grooves on the moon’s surface. There’s been a debate about what
caused these grooves.....
58348
https://www.universetoday.com/140593/st ... s-surface/