Among those challenges, two are remarkable: one mentions the ''untying'' of Orion's belt, and the other is the ''binding'' of the Pleiades. One recently astronomers could measure the proper movement of those stars; Orion's belt is moving apart, with each star going in a different direction, while the Pleiades are moving together. | Among those challenges, two are remarkable: one mentions the ''untying'' of Orion's belt, and the other is the ''binding'' of the Pleiades. One recently astronomers could measure the proper movement of those stars; Orion's belt is moving apart, with each star going in a different direction, while the Pleiades are moving together. |