11.   But what exactly was that celestial object?

12.   He and assistants spent a few years tediously examining Palomar photographs of the night sky until they had identified and cataloged every star, galaxy and other celestial object.

13.   He was among the earliest proponents of infrared astronomy, in which the physics and chemistry of celestial objects are revealed by the heat they reflect.

14.   His work led to the discovery of many celestial objects, but in one instance it ended in embarrassment.

15.   How could a celestial object observed five years before Christ be the star that led the Magi to the birth of Jesus?

16.   If all celestial objects were of the same intrinsic brightness, then their distances could be easily gauged by measuring the amount of their light reaching Earth.

17.   If they work, the crash-landing technique could be used in subsequent missions to prick the skins of other celestial objects.

18.   In ancient times, astronomers named celestial objects after gods and mythical creatures.

19.   In fact, the museum disputes the categorization of celestial objects into a list of planets, moons, asteroids and the like.

20.   In the world of astronomy, a newly found celestial object is named by its discoverer.