With 3I/ATLAS streaking away from our planet, speculation remains as to whether the interstellar comet is alien or not.
The answer is as obvious as it seems – the Earth looks flat when you're standing on it, not cone-shaped. Visual evidence ...
Early Mars seems to have had a protective atmosphere and liquid water in the form of oceans, rivers, and lakes. It may also ...
A new computational model suggests that Uranus' and Neptune's cores may be less icy than their "ice giant" nickname suggests.