<Li> to find z> 8 galaxies stretched out enough by cluster lensing to discern internal structure and / or magnified enough by cluster lensing for spectroscopic follow - up . </Li> <P> Anyone can apply for time on the telescope; there are no restrictions on nationality or academic affiliation, but funding for analysis is only available to US institutions . Competition for time on the telescope is intense, with about one - fifth of the proposals submitted in each cycle earning time on the schedule . </P> <P> Calls for proposals are issued roughly annually, with time allocated for a cycle lasting about one year . Proposals are divided into several categories; "general observer" proposals are the most common, covering routine observations . "Snapshot observations" are those in which targets require only 45 minutes or less of telescope time, including overheads such as acquiring the target . Snapshot observations are used to fill in gaps in the telescope schedule that cannot be filled by regular GO programs . </P> <P> Astronomers may make "Target of Opportunity" proposals, in which observations are scheduled if a transient event covered by the proposal occurs during the scheduling cycle . In addition, up to 10% of the telescope time is designated "director's discretionary" (DD) time . Astronomers can apply to use DD time at any time of year, and it is typically awarded for study of unexpected transient phenomena such as supernovae . </P>

When was the last time hubble was 'serviced'