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The highly anticipated "Warhammer 40K: Space Marine 2" came out today (Sept. 9). Get hyped for the new game by checking out this brutal new launch trailer.

Organisms on Earth living deep underground or at the bottom of the sea may give us an idea what alien life without a circadian rhythm could be like.

"It's now a part of mainstream astrophysics."

September could be a prime time to see vibrant auroras, thanks to a quirk of Earth's tilt that leads to more intense geomagnetic activity around the equinox.

On Sept. 9, 1982, the first private rocket launched from a Texas cattle ranch.

The Polaris Dawn mission is currently scheduled to launch on Tuesday, Sept. 10. Liftoff is scheduled for 3:38 a.m. EDT (0738 GMT) from Florida's Cape Canaveral.

SpaceX is targeting Sept. 10 for the launch of its Polaris Dawn mission, which will feature the first-ever private spacewalk. Here's how you can watch the historic action live.

Find out the latest about SpaceX's private Polaris Dawn spacewalk mission for billionaire Jared Isaacman.

Machine learning algorithms analyzed millions of galaxies to reveal where the biggest ones are.

SpaceX's private Polaris Dawn mission is poised to launch a crew of private astronauts farther from Earth than any human has flown since Apollo 17.