A mysterious new world may be hiding in the outer reaches of our solar system. According to arecent study published on arXiv ...

A new study suggests the existence of Planet Y. This hidden planet may be affecting the Kuiper Belt. The gravity of Planet Y ...

Today in the history of astronomy, NASA announces our first view of the rings of Neptune.

On Aug. 1, Venus will form a tense square to Saturn and Neptune, creating tension between the desire for love and comfort versus the boundaries that need to put in place. Discover what this means for ...

Neptune is the fourth largest planet in the solar system, with a radius of 15,599.4 miles (24,622 kilometers) — the distance between its core and the surface.

Mark your calendar so you can catch Mercury, Venus, Jupiter, Saturn, Neptune and Uranus in the sky at the same time.

Neptune's Fix supplements purport to contain tianeptine, an opioid alternative prescribed as an antidepressant in some Latin American, Asian and European countries.

In terms of mass, if you add up all the satellites of Neptune, Triton composes 99.5% of the mass of everything orbiting Neptune: moons, moonlets, and rings all included.