Field of View—The area visable in an image, usually given as the diaeter of the region
Scientific notation—the system of recording very large or small numbers by using powers of
10
1.1From Solar System to Galaxy to Universe:
• CERN is home of Large Hadron Collier, largest particle accelerator in operation
• Astronomy is the study of large numbers
Astronomical Unit—average distance from the earth to the sun. 1.5x10 to the 8 kilometers
Solar system—the sun and its planets, asteroids, comets, etc.
Planet—a non-luminous body in orbit around a star, large enough to be spherical and to have
cleared its orbital zone of other objects
Star—a globe of gas held together by its own gravity and supported by the internal pressure of
its hot gases, which generate energy by nuclear fusion
• Proxima Centauri is the nearest star to the sun, 4.2 ly away from e
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