The Globe and Mail reports in its Saturday edition that a SpaceX rocket is on a collision course with the moon. Its upper stage will impact the moon on Wednesday, creating a crater and sending up dust and rubble for scientists and sky gazers to observe. An Associated Press dispatch to The Globe reports that space tracker Bill Gray predicts an impact of 8,700 km/h, seven times the speed of sound, near Einstein Crater on the moon's sunlit western limb. Best views will be in the eastern U.S., Canada, and much of South America during the early hours. While scientists are not too concerned about this piece of space junk, it highlights the growing threat as more and more items cram into orbit. It was never SpaceX's intent to hit the moon. But space experts said the crash could have been avoided if the upper stage had been nudged into orbit around the sun. Lucky for astronomers, the upcoming smash-up will occur on the moon's near side, packing the equivalent energy of three tons of TNT. The impact flash, lasting less than a second, will probably be too dim to see, according to experts. But the stream of ejected material could stretch for several kilometres into space and remain visible to telescopes for tens of minutes.