As we journey around the galaxy, our solar system might regularly interact with dark matter, which might dislodge Oort cloud comets and boost heat in Earth's core.

Scholz's star passed only 0.8 light-years from our sun, only 70,000 years ago. It came closer than any other known star, sweeping through the Oort comet cloud.

Amateur astronomers spotted them first, but they show up in Hubble images, too. Astronomers are scratching their heads, wondering these mystery plumes are.

It's a fast-rendezvous, six-hour launch-to-dock mission to the International Space Station. Docking will occur later today. Online viewing details here.

New maps from Planck mission support theory of cosmic inflation, the idea that, in the moments following Big Bang, space expanded faster than the speed of light. George Efstathiou - a Planck mission leader - explains more to Kavli Institute's Kelen Tuttle.

The private venture Mars One has announced its selection of 50 men and 50 women who will compete via reality TV for a one-way Mars trip, as early as 2024.

At the core of a galaxy called the Teacup, jets from a central supermassive black hole may be gradually destroying the galaxy's ability to form new stars.

It's a tough measurement, but astronomers in Stockholm say they've proven dark matter exists in our part of the galaxy.

Spacecraft is headed to L-1 point in Earth-sun system, where it'll provide advance warning of incoming solar storms that can disrupt power grids and satellite systems.

Astronomers tinkering with ice and organics in the lab might have discovered why icy comets have hard, outer crusts.