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Astronauts aboard the space shuttle Columbia made major progress today in repairing NASA's $150 million observatory after losing almost a full day of precious stargazing time.

Mission specialist Robert Parker said all three star trackers in the instrument pointing system finally appeared to be working well.

By manually operating the system, the astronauts were able to look briefly at star clusters today and a distant galaxy and two stars Monday. NASA said up to 10 percent of the shuttle mission's 230 planned observations might have to be scrapped because of the earlier problems in aligning three of the Astro observatory's four telescopes.

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