1.   Consequently, the calendar ceased to be the primary motive for celestial observation.

2.   Astronomers plan to resume celestial observations in about two weeks.

3.   Celestial observations were suspended last week.

4.   Celestial observations with the telescope ceased in mid-November when the Hubble experienced its fourth gyro failure in two years.

5.   Crucial to the precise pointing of the telescope, the new gyros will enable astronomers to resume the celestial observations halted in mid-November because of successive failures.

6.   NASA is considering extending the flight by two days so the crew can conduct additional celestial observations.

7.   Scientists have requested the extra time for additional celestial observations.