... Tonight's Sky . ... News . Observing . ... space flight . ... Shuttle offers new hope for Hubble . ... S cientists hoping to eke out a few more years for the Hubble Space Telescope will be closely watching the upcoming launch of space shuttle Discovery, which is scheduled for liftoff Saturday afternoon. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...