"It's been such a puzzle that there was liquid water on Mars, because Mars is further from the sun, and also, the sun was ...

The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for ...

For millions of years, Mars enjoyed oceans blanketed by a thick atmosphere and a temperate climate. At the same time, Earth was a far less favourable habitat. Our planet was toxic to life today ...

As these charged particles interact with the planet's magnetic field and atmosphere, we may see spectacular auroras over polar regions on Earth. Given Mars's ... pressure compared to solar wind ...

Earth-like blue skies could appear, and rivers and oceans could return. With its carbon dioxide-rich atmosphere, and artificially increased ammonia levels, Mars could have an ozone layer that is ...