The Oldest Known Spiral Galaxy Has Ripples Like the Surface of a Pond

Researchers propose that if a terrestrial planet has substantially less carbon dioxide in its atmosphere compared to other planets in the same system, it could be a sign of liquid water — and possibly life — on that planet’s surface.

Taken only 1500 miles above the surface, new images highlight the amazing volcanic landscape of Io

The Atmosphere of an Exoplanet Reveals Secrets About Its Surface