Scientists challenge belief of moon's dormant volcanoes with evidence of volcanic activity as recent as 120 million years ago ...

New research suggests Mars' missing atmosphere -- which dramatically diminished 3.5 billion years ago -- could be locked in the planet's clay-covered crust. Water on Mars could have set off a chain ...

We know Mars once had an active geological past, filled with water, volcanic activity, and dynamic geological changes. Now, ...

Visitors can carefully enter these underground caves and follow the path of the molten rock that once flowed and now features stone icicles and fascinating patterns. Note: The lava tubes are open ...