Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
News that broke in The Situation Room: For the second time this year, one of the pumps that cools the International Space Station has failed. NASA says the crew is not in imminent danger, but as CNN's John Zarrella reports, they will have to conduct a space walk to fix the malfunction.
The spacecraft should break up as it re-enters the atmosphere but no one knows where the space junk will hit.
It skyrocketed to the top of the box office this past weekend, but many in the scientific community and beyond are asking how accurate is the blockbuster "Gravity"? CNN's Jeanne Moos talks to one astronaut and has him weigh in on star Sandra Bullock's tools, underwear, and hair.
Space agencies confirm they've found a deep azure blue planet orbiting a star 63 light years away.
Though the days of NASA's space shuttle launches are over, the rocket building business is booming. CNN's John Zarrella reports.
CNN's Lisa Sylvester reports on earth's defense against exploding meteors and fly-by asteroids.
CNN's Tom Foreman takes a look at a meteor that exploded over Russia and an asteroid that passed by Earth.
CNN's Chad Myers has the details of an asteroid scientists say will narrowly miss hitting Earth in February.
You could easily skip by it in an archive search: a project titled "A Study of Lunar Research Flights." Its nickname is even more low-brow: "Project A-119."
But the reality was much more explosive.
It was a top-secret plan, developed by the U.S. Air Force, to look at the possibility of detonating a nuclear device on the moon.