as·​tro·​phys·​ics | \ ˌa-strə-ˈfi-ziks How to pronounce astrophysics (audio) \

Definition of astrophysics

: a branch of astronomy dealing especially with the behavior, physical properties, and dynamic processes of celestial objects and phenomena

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Other Words from astrophysics

astrophysical \ ˌa-​strə-​ˈfi-​zi-​kəl How to pronounce astrophysics (audio) \ adjective
astrophysically \ ˌa-​strə-​ˈfi-​zi-​k(ə-​)lē How to pronounce astrophysics (audio) \ adverb
astrophysicist \ ˌa-​strə-​ˈfi-​zə-​sist How to pronounce astrophysics (audio) , -​ˈfiz-​sist \ noun

Examples of astrophysics in a Sentence

Recent Examples on the Web In addition, Escoto uses literature to tie geology, zoology, biology and astrophysics into her photography. Diane Lopez, San Diego Union-Tribune, 30 Aug. 2021 Rahul Rajendran dreamed of attending an Ivy League school in the United States to study astrophysics. Connie Foong, The Christian Science Monitor, 8 June 2021 My understanding is that, broadly speaking, physics is the study of very small things — quantum physics, particle physics — and very big things — astrophysics, relativity theory. David Marchesephotograph By Mamadi Doumbouya, New York Times, 17 Apr. 2021 But astrophysics is a little bit different than physics. Ethan Siegel, Forbes, 2 June 2021 Nvidia and the National Energy Research Scientific Computing Center has debuted Perlmutter, which is said to be the fastest supercomputer specifically tailored for A.I.-related tasks to study climate and astrophysics. Jonathan Vanian, Fortune, 1 June 2021 Calls for missions will come up periodically looking for ideas in themes spanning astronomy, astrophysics, fundamental physics (again to figure out our universe’s history) and a field called astrometry, which tracks the motion of celestial objects. Elizabeth Howell, Forbes, 15 June 2021 At ELI-Beamlines near Prague, researchers have begun first experiments with lasers that will reach up to 10 petawatts in power, yielding x-rays and ions for use in materials science, astrophysics, and biomedicine. Edwin Cartlidge, Science | AAAS, 19 May 2021 Raja GuhaThakurta, department chair of astronomy and astrophysics at UC Santa Cruz, said while these particular satellites are meant to be good for human society, their potential effect on astronomical observations is a major concern. Kellie Hwang, San Francisco Chronicle, 23 May 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'astrophysics.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of astrophysics

1870, in the meaning defined above

History and Etymology for astrophysics

International Scientific Vocabulary

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Time Traveler for astrophysics

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The first known use of astrophysics was in 1870

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Last Updated

15 Sep 2021

Cite this Entry

“Astrophysics.” Dictionary, Merriam-Webster, Accessed 20 Sep. 2021.

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English Language Learners Definition of astrophysics

: the scientific study of the physical and chemical properties and structures of stars, planets, and other objects in outer space


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