make its Mars missions a reality. Read our full story here.

Red Dragon Enters Mars Atmosphere

SpaceX

SpaceX's Red Dragon concept would send a Dragon-based spacecraft to Mars and use the capsule's thrusters to make a landing. This artist's illustration shows how Dragon could enter Mars' atmosphere. SpaceX has successfully returned Dragon capsules to Earth during space station resupply missions for NASA. Read our full story here.

SpaceX's Dragon Version 2 Spacecraft: How it Works (Infographic)

by Karl Tate, Infographics Artist

SpaceX's Dragon Version 2 spacecraft is a manned space capsule designed to fly seven astronauts to and from low-Earth orbit. See how SpaceX's Dragon V2 spacecraft works in this Space.com infographic.

How the SpaceX Falcon Heavy Rocket Works (Infographic)

By Karl Tate, Infographics Artist

SpaceX's Falcon Heavy rocket is a heavy-lift booster that will be theFeatured Videos

Marine Corps Marathon Registration Sells Out In Less Than Three Hours

ARLINGTON, VA - OCTOBER 31: Coast Guard helicopters pass over as runners cross the Key bridge during the Marine Corps Marathon October 31, 2010 in Arlington, Virginia. Event organizers have requested increased security at the annual 26.2 mile race after the National Museum of the Marine Corps was shot at twice this month by the same weapon used in similar acts at the Pentagon and a vacant Marine Corps recruiting station in Chantily, Virginia. (Photo by Brendan Smialowski/Getty Images)credit: Brendan Smialowski/Getty Images

WASHINGTON (CBSDC/AP) — Registration for the 37th Marine Corps Marathon, which has a race course that winds through Virginia and the nation’s capital, sold out in a less than three hours.

In the 36th Marine Corps Marathon