However, at Neptune’s surface, the gravity is only about 1.1 times the gravity we experience on Earth. In other words, if ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.

Neptune is called an “ice giant” because it’s mostly made of a thick, slushy mix of water, methane, and ammonia, which ...

Neptune with its rings and several of its moons clearly visible, as captured by the James Webb Space Telescope’s Near Infrared Camera. NASA, ESA, CSA, STScI ...

Explore all 16 of Neptune's moons along with their names and dates of discovery. The Neptunian system hosts some very strange and elusive moons.

It orbits Neptune backward, possibly because it was once a dwarf planet like Pluto and Sedna that got caught up in Neptune’s gravity and pulled into what astronomers call a retrograde orbit.

A passing star, or a stellar flyby, with the potential to pull Neptune out of its orbit by just 0.1%, could mean catastrophe for the entire solar system. But don’t worry — it won’t happen in ...

But running counter to Neptune’s spin is an unsustainable slog. Neptune’s gravity is slowly sapping energy from Triton, causing the moon to inch closer to Neptune.

Size: Neptune is slightly smaller than Uranus and has a diameter of 31,000 miles (50,000 kilometers), so about 4 Earths would fit across its face. Distance from the Sun: Neptune is the eighth ...

Astronomers also hypothesize these new moons were captured by the gravity of Uranus and Neptune either during or shortly after they formed. How did astronomers find the new moons? Dozens of long ...