Mercury has almost no boulders on its surface and we're not sure why

Researchers examined about 3000 of the best images we have of the planet Mercury, and only 14 of them contained boulders – far fewer big rocks than expected

Mercury has almost no boulders on its surface and we're not sure why
Researchers examined about 3000 of the best images we have of the planet Mercury, and only 14 of them contained boulders – far fewer big rocks than expected