[DB 1507 (38); OAB pp.17-18] This was formerly a widely-used young-Earth claim, but it has now been discredited. Nonetheless, it is still sometimes repeated in young-Earth circles. One of the first estimates of dust expected on the Moon was made in 1960 by Hans Pettersson. Pettersson estimated the influx of space dust by standing on top of a mountain with a device used to measure smog levels. By assuming (incorrectly) that all of the nickel dust he detected came directly from outer space, Pettersson arrived at a very large estimate of the amount of space dust falling on the Earth (and the Moon). When the Apollo landers found that the amount of dust on the Moon was much less than suggested by Pettersson's measurements, some young-Earth advocates claimed this proved that the Moon was young. Not long after Pettersson, however, the influx of space dust was measured by satellites. It has been measured several different ways now, and is known to be almost 1,000 times smaller than Pettersson thought. In fact, there is no discrepency whatsoever between the influx of space dust and the amount of dust found on the Moon's surface. Nowadays, most of the more responsible young-Earth advocates have ceased to use this claim. For example, Snelling and Rush (Creation Ex Nihilo Technical Journal, v.7, pp.2-42 (1993)) not only explain why the moon-dust argument is untenable, they also refute the commonly-repeated myth that Apollo scientists were afraid that their landers would sink into a deep dust layer.