Emit+heat
71Methane — Methane …
72X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …
73Brown dwarf — Brown dwarfs are sub stellar objects which are too low in mass to sustain hydrogen 1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no… …
74Habitability of red dwarf systems — Determining the habitability of red dwarf systems could help reveal how likely extraterrestrial life is to exist, as red dwarfs make up a majority of all the stars in the galaxy. Critical factors assumed to be impediments to habitablity include… …
75Future of an expanding universe — Big Freeze redirects here. For other uses, see Big Freeze (disambiguation). Physical cosmology Univ …
76Spark plug — A spark plug (also, very rarely nowadays, in British English: a sparking plug) is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark.… …
77Radioisotope thermoelectric generator — A radioisotope thermoelectric generator (RTG, RITEG) is an electrical generator which obtains its power from radioactive decay. In such a device, the heat released by the decay of a suitable radioactive material is converted into electricity by… …
78give off — verb 1. have as a by product (Freq. 2) The big cities gave off so many wonderful American qualities • Hypernyms: ↑have, ↑feature • Verb Frames: Somebody s something Something s something …
79Laser diode — Top: a packaged laser diode shown with a penny for scale. Bottom: the laser diode chip is removed from the above package and placed on the eye of a needle for scale …
80Fire extinguisher — Extinguisher redirects here. Extinguisher may also refer to a candle snuffer. A stored pressure fire extinguisher …
