New photos add to rich history of shots of Earth from space since 1960s

President John F. Kennedy spelled out the mission clearly in his 1961 speech committing the United States to send humans to the moon and back by the end of the decade. He left no doubt about the definition of success and laid out a clear vision.

Now, five decades after his challenge, a panel of space, science and engineering experts said in a stinging report that NASA does not have a goal....