CAPE CANAVERAL, Fla. (AP) -- Hundreds gathered at NASA's launch site today to mark the 25th anniversary of the Challenger disaster, receiving words of hope from the widow of the space shuttle's ...

This week marks the somber 25th anniversary of the accident that killed seven astronauts aboard NASA's space shuttle Challenger less than two minutes into their flight, as millions of people ...

Outside NASA, the Challenger disaster has morphed into one of those shared traumas — like the Sept. 11, 2001, attacks or President Kennedy’s assassination — that serve as touchstones across ...

Hundreds gathered at NASA's launch site Friday to mark the 25th anniversary of the Challenger disaster, receiving words of hope from the widow of the space shuttle's commander. The chilly outdoor ...

NASA also changed its culture, he says, after learning engineers had raised concerns about the Challenger’s launch before it happened. “We could have prevented that from happening,” Cabana says.

NASA's space shuttle Challenger exploded 73 seconds after liftoff at about 46,000 feet in the air. The tragedy happened on Jan. 28, 1986.

The day before the Challenger launch disaster, senior NASA official James Beggs made an urgent phone call to the agency's chief engineer. Beggs was on temporary leave from his NASA administrator ...

Operations at NASA slowed Wednesday for the agency's annual Day of Remembrance for those who endeavored to reach beyond the edges of our world and never returned.

Thirty years ago today, the space shuttle Challenger exploded during liftoff, killing seven astronauts. Their families gathered with NASA today to mark the space shuttle accident's 30th anniversary.

NASA also changed its culture, he says, after learning engineers had raised concerns about the Challenger’s launch before it happened. “We could have prevented that from happening,” Cabana says.

36 Years Later: Challenger accident motivates NASA safety experts The API failed to deliver the resource. The lessons learned from the accident are why NASA's first protocol is always safety.

A report after the 2003 Columbia disaster noted that — Challenger notwithstanding — NASA had failed to change a culture that often rewarded ambition over safety.