Neptune

"We're actively and aggressively pursuing this case because we really want to know who would be so cruel to abandon this animal," the MCSPCA told Newsweek.

The planetary parade will likely only be visible until December 31 as Mercury rapidly fades.

Mercury, Venus, Mars, Jupiter and Saturn can be seen with the naked eye, while Uranus and Neptune can be observed with binoculars or a telescope.

The absent moon, called Chrysalis, might also explain why the planet tilts slightly in its spin.

Becky Smethurst tells Newsweek a black hole is a couch cushion, "not pulling anything towards them. But if you lose something down the side, it's gone forever."

At the edge of the solar system is a fascinating world of ice and violent 1,000mph winds, Neptune. Here are six incredible facts about Neptune.

The exoplanet orbits its dwarf star in 35 days and has a very cold surface temperature, but astronomers believe it could still host life in its clouds.

"It's incredible to be able to make these kinds of discoveries," said researcher David Armstrong.

We have found objects in the Kuiper Belt that do not fit with the idea of a huge, mystery planet at the edge of the solar system.

"These selected missions have the potential to transform our understanding of some of the solar system's most active and complex worlds," NASA's Thomas Zurbuchen said.

Two of Neptune's inner moons are locked together in a type of orbit that has not been seen before. This allows them to cross paths without coming into contact, researchers say.

The planet is the first of its kind to be discovered in the "Neptunian Desert"—the region immediately surrounding stars where no planets similar in size to Neptune are found.

Months after Russia seized three Ukrainian navy ships in the Sea of Azov, the project is more relevant than ever.

These ancient rocks are relics of the early solar system.

"One Piece" Chapter 907 has released in Japan and it continues the story of the Reverie. Here's everything happened in the latest chapter.

The planets face supernovas, gamma-ray bursts and gravity-disrupting stars in the crowded center of the Milky Way.

The storm could smell like rotten eggs, according to scientists.

Neptune and Uranus could have thin exterior shells of liquid water and thick interior mantles of superionic ice water.

Dry your eyes and grab your binoculars. There's still plenty to see.

The discovery of a small, icy world is raising questions about the entire prospect of a ninth planet.

The planet is believed to be 5,000 times the mass of Pluto.

Astrophysicists cite orbit patterns, but some critics are not yet ready to believe.