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
the explosive death of a massive star whose energy output causes its expanding gases to glow brightly for weeks or months
the control of robots from a distance
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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Appendix F: Glossary ."
Assessment of Options for Extending the Life of the Hubble Space Telescope: Final Report . Washington, DC: The National Academies Press,
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.