But that landing was cancelled in 2004 , though two orbiters should still make the journey .
但是,2004年取消了这次计划中的登陆,不过仍将有两颗人造卫星登上旅程。
Each of the shuttle orbiters are now undergoing decommissioning in preparation for being placed on public display .
所有的穿梭轨道飞行器现在处于退役中,准备对公众展示。
In that decade , as part of preparations for the apollo manned landings , nasa sent a series of probes called lunar orbiters to scan the moon 's surface for landing sites .