The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for decades. Now, researchers think they have a good explanation for a warmer, ...

While the early climate of Mars remains an open question, a new study suggests that its atmosphere may have been hospitable to life due to volcanic activity that emitted sulfur gases that contributed ...

Ancient ripple layers on Mars capture a single sandstorm, helping scientists estimate how dense the planet’s atmosphere once was.

For years, scientists have puzzled over how Mars lost the thick atmosphere it once had. That atmosphere was essential for liquid water to exist on the planet’s surface, billions of years ago. Today, ...

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 what ...

For all the drama around getting to Mars, the harder question starts after landing. A person can step onto the planet with ...

Tue, April 22, 2025 at 1:00 PM UTC One of the big remaining conundrums is what exactly happened in Mars’ ancient past that transformed the world from a wet and warm one to the cold, dry orb we see ...

It's not entirely clear how neighboring planet Mars went from a presumably life-supporting planet to a place as dead as all others in the solar system. We do know, however, that whatever water and ...

Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a ...