'Extensive' water found in Mars' interior

There's vastly more water in Mars's mantle than previously thought - as much as on Earth, in fact - dramatically raising the chances that the planet might once have sustained life.

Aerosol geoengineering could make sky white instead of blue

Some scientists advocate pumping aerosols into the atmosphere to counter global warming by reflecting solar energy away.

Much more water on moon than thought

There's a lot more water in the moon's interior than previously believed, say scientists at the Carnegie Institution’s Geophysical Laboratory.