Not yet extinct, but getting there: experts estimate only 10 of this endangered species remain. Here's a list of the top 10 ...

There are endangered animals, and then there are those that are the last of their kind. The world's rarest animal is just that.

By being someone who is drawn to spiritual extremes, you allow your soul to experience both sides of belief. You're not only ...

The LIFE mission would feature four space telescopes acting together to search for biosignatures on rocky planets in the habitable zones of their stars.

An astrophysicist says he may have an explanation for ring galaxies, the rarest types of galaxies found in the universe.

The desert mule deer is a common sight in west Texas, but wildlife biologists in the area came across an extremely uncommon sight.

Intermediate-mass black holes—somewhere between stellar-mass and supermassive—are the rarest type of black hole in the universe. 300 of these elusive black holes were recently observed by NSF ...

Astronomers have discovered a rare group of five dwarf galaxies located relatively close to Earth; these galaxies exist in a near-perfect alignment, resembling a string of cosmic pearls in the sky.

The universe rarely fails to amaze. One of its latest surprises—nicknamed the “Einstein zig-zag”—reveals a stunning arrangement of galaxies and a distant quasar.

These extremely rare mammals are some of Australia’s hardest to find, as only 400 are left in the world, the Australian Wildlife Conservancy shared in a news release.

What is the rarest animal in the world? The vaquita is the rarest animal in the world and the rarest marine mammal. These porpoises swim in the Gulf of California and were only discovered in 1958, ...