For years, scientists have puzzled over how Mars lost the thick atmosphere it once had. That atmosphere was essential for ...

A new study may solve a central mystery of the planet’s 4.6-billion-year history. Despite increasing evidence that water flowed on Mars billions of years ago, scientists have been mystified by ...

You may like Mars is covered in evidence of ancient lakes, rain and snow ... which is just carbon dioxide collapsing from the atmosphere." Related: Water on Mars: Exploration & evidence ...

Tom Howarth is a Newsweek reporter based in Bristol, U.K. His focus is reporting on nature and science. He covers climate change, biodiversity, extreme weather, zoonotic diseases and more.

Today, Mars is very cold and dry, with little atmosphere and no liquid water on the surface − traits that make it a hostile environment for life. But some observations suggest that ancient Mars ...

A lone researcher may have figured out how Mars was able to support rivers and seas even after the planet had begun to grow cold and its atmosphere thin, and it's all thanks to a cycle of water ...

Today, Mars is very cold and dry, with little atmosphere and no liquid water on the surface—traits that make it a hostile environment for life. But some observations suggest that ancient Mars ...