Satellites vs. space junk: evening the odds

 作者:商雾洚     |      日期:2019-03-01 05:09:02
By Paul Marks THE threat to spacecraft from fast-moving space junk could be lessened thanks to a new way to measure how much fuel satellites have left in their tanks. Satellite operators need to know when a craft is running low on fuel so they can use the last of its propellant to thrust it into a high-altitude orbit out of the way of other spacecraft. Accuracy is everything though: ditch a satellite too soon and a multimillion-dollar resource is wasted early; leave it too late and you create hazardous space junk. At present,