A newly discovered planet has the diameter of Jupiter but eight times its mass, giving it twice the density of Earth despite being composed mostly of gas. Not only have these characteristics of this ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

Researchers have discovered a new, innermost layer nestled inside our planet’s inner core, a 400-miles solid metallic ball that responds to the reverberating shockwaves of earthquakes in an unexpected ...