A previously unknown group of tiny and bizarre algae belongs to an entirely new evolutionary lineage, researchers say.

Deep down, the moon may be a lot like Earth—and was probably born of Earth, according to a new look at moon rocks retrieved by Apollo astronauts.

The latest x-ray image of the remains of an exploded massive star reveals that the star died in a thermonuclear blast, astronomers say.

A new project plans to detect low-frequency signals sent by alien civilizations—from military radar to the ET version of talk radio.

The Internet giant has signed on to help make data from what will be the largest sky survey readily available to the public.

The discovery of eight tiny galaxies near our own may provide scientists with insights into the structure of the universe.

Based on a new infrared image, the iconic space formation was likely destroyed 6,000 years ago—but we won't see it happen for another thousand years.

The first observed trio of these enormous, hyperactive black holes offers insights into galaxy collisions that took place in the cosmic past.

A pulsating star, or pulsar, in the Crab Nebula may be the first known celestial body to have more than two poles, astronomers said Monday.

Scientists have created a detailed, three-dimensional map of dark matter's evolution over time—revealing that the mysterious substance forms the scaffolding for stars and galaxies.

A large egg-shape region in the state's "toe" is slowing oozing into the Gulf of Mexico, researchers report, another reason cities in the area are at risk of damaging floods.

Stem cells that can grow into a variety of human tissues have been discovered in the fluid that surrounds a fetus during pregnancy, researchers say.

Titan has lakes of methane and a hydrological cycle that resembles in uncanny detail the one found on Earth, a new study finds.

Chimp birth control, a New Year's plunge, a record snowfall, and a Renaissance murder mystery all color this week's images to remember.

A Swedish firm will soon launch a service using 3-D maps of faces to enhance photo searches, raising concerns that the technology could violate people's rights and aid criminals.