Martian water may flow on sunny summer slopes

Help

Striking new images from the mountains of Mars may be the best evidence yet of flowing, liquid water, an essential ingredient for life.

The findings, reported on Thursday in the journal Science, come from a joint US-Swiss study.

A striking sequence of images from the Mars Reconnaissance Orbiter show many long, dark "tendrils" a few metres wide emerging between rocky outcrops and flowing hundreds of metres down steep slopes towards the plains below.

They appear on hillsides warmed by the summer sun, flow around obstacles and sometimes split or merge, but when winter returns, the tendrils fade away. The BBC's Daniel Griffiths reports.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.