NASA Science Briefing: Comet Siding Spring at Mars

Gigantic groundwater outbursts created the largest flood channels in the solar system on Mars, 3.2 billion years ago. For many years it was thought that this was caused by the release of water from a global water table, but research just published reveals regional deposits of sediment and ice emplaced 450 million years earlier to be the source.

The United Arab Emirates “Hope” probe is now making repeated close flybys of the martian moon Deimos – and snapping spectacular pictures.

New research indicates most of the water that once flowed and pooled on Mars may still be there, locked in minerals making up the planet’s crust.