NASA has announced that America is now just days away from a historic return to the moon for the first time in two generations. The space agency revealed that the earliest Artemis II, the first manned mission to the moon since 1972, will set off on this flight is February 6. NASA officials noted that the official launch window for Artemis II will remain open from January 31 to February 14, and several alternate dates for the launch have also been picked out. Artemis II can't launch on just any day. The timing will depend on precise orbital mechanics, such...