1.   Like the precise astronomical observations of the Maya, these technical achievements proved to be a dead end.

2.   This is because astronomical observations using the hardware can take place only at certain times of the year.

3.   Astronomical observations have recently suggested that the ices of large comets are rich in organic chemicals.

4.   Astronomical observations have shown that only a tiny fraction of all the matter in the universe is in bright stars or other visible matter.

5.   Astronomical observations reveal an expansion still under way, with the most distant regions of the universe accelerating away at the greatest velocity.

6.   At least three are necessary for astronomical observations.

7.   Even if a second one failed, Kniffen said, Sun sensors and the magnetometer could be used to orient the spacecraft for astronomical observations.

8.   If recent astronomical observations are correct, the future of life and the universe will be far bleaker.

9.   Such adjustments would mean that other astronomical observations are somehow wrong.

10.   The center operates several telescopes on Mount Hop kins, one of the premier spots for astronomical observation in the con tinental United States.