Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet X, that might be warping the orbits of objects beyond Neptune ...

If you’re feeling on the precipice of a great change: you’re right on time. On the 28th, Neptune—planet of idealism—forms a ...

Though the days are fast ticking by, that success is far from assured. DART is the first-ever test of what NASA calls a kinetic impactor—a projectile intent on transferring its momentum to an asteroid ...

Mercury, the smallest planet in the solar system, has spent billions of years quietly getting even smaller. Since its fiery ...