It's been 40 years since 7 people were killed in the Challenger space shuttle explosion

It's been 40 years since the Challenger space shuttle, carrying seven people, took off from Florida's Kennedy Space Center, ...

'It's part of his story': Daughter remembers astronaut dad 40 years after Challenger explosion

"I lost my father," Alison Balch said, "but to everyone else, they felt like they lost somebody also." ...