Astronomers have discovered a new type of alien world — the first known "ultrahot Neptune," a giant planet that orbits its star 60 times closer than Earth does the sun, a new study finds. Previous ...

The European Space Agency's Gaia spacecraft helped track Neptune's largest moon, Triton, as it passed in front of a distant star, allowing astronomers to study the moon's atmosphere in greater detail.

Researchers have found that if a star flying past our solar system moved Neptune’s orbit by just 0.1 per cent, it would result in pandemonium. A minor shift in the outer planet’s orbit could ...