| 21. | Various related terms are used for other celestial objects.
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| 22. | In the world of astronomy, a newly found celestial object is named by its discoverer.
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| 23. | In the 1790s, English astronomer William Herschel began an extensive study of nebulous celestial objects.
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| 24. | The principal method by which astronomers determine the composition of a celestial object is spectroscopy.
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| 25. | Analysis of the lines allows scientists to calculate the chemical composition of distant celestial objects.
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| 26. | The celestial object was discovered on September 27 1826 by the Scottish astronomer James Dunlop.
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| 27. | But celestial objects do not shine with uniform brightness.
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| 28. | A celestial object is moving out from behind Earth.
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| 29. | Amateur astronomers might appreciate a $ 50, 000 reward for discovering a threatening celestial object.
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| 30. | The celestial object was discovered on 30 December 1836 by the British astronomer John Herschel.
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