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Appendix F: Glossary
Pages 134-136

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From page 134...
... The time period over which the star varies is directly related to its light output or luminosity, making these stars useful standard candles for measuring intergalactic distances. dark energy the residual energy in empty space which is causing the expansion of the universe to accelerate de-scope the reduction or elimination of some objectives, performance requirements, or capabilities compared to those in an earlier baseline plan 134
From page 135...
... Milky Way Galaxy The Milky Way, a spiral galaxy, is the home of Earth, the Sun, and the rest of our solar system. orbital debris any man-made object, or portions thereof, in orbit about Earth which no longer serves a useful purpose planetary nebula an expanding shell of glowing gas expelled by a star late in its life proto-solar system matter that is beginning to come together to form a star and its collection of orbiting planets quasar the brightest type of active galactic nucleus, believed to be powered by a supermassive black hole.
From page 136...
... 136 ASSESSMENT OF OPTIONS FOR EXTENDING THE LIFE OF THE HUBBLE SPACE TELESCOPE spherical aberration an example of optical aberration, a deviation from perfect image formation in which light from different parts of a mirror or lens is brought to different foci supernova the explosive death of a massive star whose energy output causes its expand ing gases to glow brightly for weeks or months teleoperation the control of robots from a distance Weibull distribution a general-purpose reliability distribution used to model material strength and times-to-failure of electronic and mechanical components, equipment, or systems

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