Scientists Detect Multiple Underground Lakes on Mars

Mars from Hubble: Astronomers took advantage of a rare close approach by Mars in 2001. When the Red Planet was just 43 million miles away, Hubble snapped this picture with the WFPC2. It has a surface resolution of just 10 miles. This is the best image we’ve gotten of Mars that didn’t involve sending a robot there.

In 2018, scientists working on the European Space Agency's Mars Express project reported Mars may have a liquid water reservoir under its barren surface. The evidence was interesting but not completely convincing. Now, Mars Express has confirmed the detection of that original underground lake and discovered three more. Naturally, this has scientists excited about the possibility for life.