Mars once looked far more like Earth, with a thicker atmosphere and liquid water pooling on its surface, yet today it is a frozen desert where even a thin wisp of air struggles to hold on. NASA’s ...

Mars is a cold, dry, desert-like planet. But billions of years ago, scientific evidence suggests that it had a thick atmosphere, which kept it warm enough to support flowing water on its surface. So, ...

Cheers erupted Monday at the Jet Propulsion Laboratory in Pasadena, California, which operates the spacecraft, when InSight sent back acknowledgment of its safe arrival on Mars. Cheers erupted Monday ...