Astronauts take moment of silence in space on anniversary of Challenger explosion

The seven astronauts killed on January 28, 1986 when Challenger exploded 73 seconds after launch. —NASA

Astronauts at the International Space Station paused for a moment of silence on Thursday to mark the 30-year anniversary of the Challenger explosion that killed New Hampshire teacher Christa McAuliffe and six others.

Commander Scott Kelly gave a brief statement, referencing Challenger as well as the astronauts killed in the Apollo 1 fire and the Columbia shuttle disaster.