Space Topic 1-3

2. a natural object in space, such as the Sun, the Moon, a planet, or a star
8. the study of spectra; example: looking at the dark lines' placement in the solar spectrum to see if it matches the bright lines produced by various elements
9. an oval shape for which the distance from one focal point to a point on the edge of the ellipse and then to the other focal point is the same no matter which point on the edge of the ellipse you choose
12. a shifting of light from an object toward the red (longer wavelength) end of the spectrum as the object moves away from Earth
13. an ancient instrument used to locate and predict the positions of the Sun, Moon, planets, and stars
15. the regular path of an object, such as a celestial body or an artificial satellite, around another body such as a planet or star
16. a distinctive pattern in the night sky formed by a group of stars; the pattern often looks like a familiar object, such as an animal
17. the lens in a telescope closer to the object
21. representing the Sun as the centre of the universe
22. representing Earth as the centre of the universe

1. a set of axes used to describe the positions or motion of things
3. the phenomenon that the observed frequency of a wave changes if the source of the wave and the observer are moving toward or away from each other
4. a device made of thousands of closely spaced slits
5. the lens in a telescope you look through; also known as eyepiece
6. an optical telescope that was launched into Earth orbit in 1990; provides images of distant galaxies and stars; light reaching its mirrors has not been distorted by the atmosphere
7. law that provides an explanation for planets' elliptical orbits; all objects are attracted to one another, the larger the mass, the greater the force of attraction
10. a celestial body that orbits a planet
11. an apparent switch in the motion of a celestial body from eastward to westward motion, or vice versa, as viewed from Earth
14. reflecting or refracting telescope used to focus light from distant objects
18. the fineness of detail a telescope can produce of the object in view
19. a celestial body that orbits one or more stars, is large enough that its gravity holds a spherical shape, and is the only body occupying the orbital path
20. an instrument that gathers and focusses light or other types of electromagnetic radiation to magnify distant objects