life on Mars
They might be a ready-made water source for explorers.
It's the very latest in spa treatments for planets that just want to be pampered.
NASA already explained the "concretion" phenomenon when a similar image made the rounds in 2014.
Analysis of rocks from the Gale crater show climate change on the Red Planet over billions of years.
If we can overcome our biological flaws—our genes and our inability to make rational choices—our days on this planet may not be numbered after all.
Microbial life was inhabiting the land up to 580 million years earlier than previously thought, and originated in an ancient hot spring.