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Astrophysics is the branch o astronomy that employs the principles o physics an chemistry "tae ascertain the naitur o the heivenly bouks, rather nor thair poseetions or motions in space." Amang the objects studied are the Sun, ither starns, galaxies, extrasolar planets, the interstellar medium an the cosmic microwave backgrund. Thair emissions are examined athort aw pairts o the electromagnetic spectrum, an the properties examined include luminosity, density, temperatur, an chemical composeetion. Acause astrophysics is a very broad subject, astrophysicists teepically apply mony disciplines o physics, includin mechanics, electromagnetism, stateestical mechanics, thermodynamics, quantum mechanics, relativity, nuclear an pairticle physics, an atomic an molecular physics.
- Keeler, James E. (November 1897), "The Importance of Astrophysical Research and the Relation of Astrophysics to the Other Physical Sciences", The Astrophysical Journal, 6 (4): 271–288, Bibcode:1897ApJ.....6..271K, doi:10.1086/140401,
[Astrophysics] is closely allied on the one hand to astronomy, of which it may properly be classed as a branch, and on the other hand to chemistry and physics.… It seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space–what they are, rather than where they are.… That which is perhaps most characteristic of astrophysics is the special prominence which it gives to the study of radiation.
- "astrophysics". Merriam-Webster, Incorporated. Archived frae the original on 10 Juin 2011. Retrieved 22 Mey 2011. Unknown parameter
- "Focus Areas - NASA Science". nasa.gov.
- "astronomy". Encyclopedia Britannica.
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