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