'NASA radar checks out ECAs, Earth-orbit crossing these, in case one is about to wipe out civilization'
an asteroid
HAPPY 50th NASA: NASA radar checks out ECAs, Earth-orbit crossing these, in case one is about to wipe out civilization
NASA radar checks out ECAs, Earth-orbit crossing these, in case one is about to wipe out civilization
NASA radar checks out ECAs, Earth-orbit crossing these, in case one is about to wipe out civilization
HAPPY 50th NASA
an asteroid
HAPPY 50th NASA