The song "XO" -- about troubled relationships -- starts with an audio clip recorded when Challenger blew up 27 years ago, killing all seven astronauts on board. NASA astronauts call its use by Beyonce "insensitive."
Beyonce, in an exclusive statement to ABC News this morning, said, "My heart goes out to the families of those lost in the Challenger disaster. The song 'XO' was recorded with the sincerest intention to help heal those who have lost loved ones and to remind us that unexpected things happen, so love and appreciate every minute that you have with those who mean the most to you.
"The songwriters included the audio in tribute to the unselfish work of the Challenger crew with hope that they will never be forgotten."