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

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 Toby Brown is a postdoctoral fellow of astrophysics at McMaster University in Hamilton, Ontario, Canada. Toby Brown, CNN, 10 Dec. 2021 More than 4,000 alien planets have now been confirmed, but they’ve been largely discovered thanks to lucky alignments, said project leader Peter Tuthill, a professor of astrophysics at the University of Sydney. NBC News, 24 Nov. 2021 Michael Rowan-Robinson, a leading astronomer and Emeritus professor of astrophysics at Imperial College London, found that data gathered by an early space telescope showed a possible candidate for the ninth planet theory. Joshua Hawkins, BGR, 16 Nov. 2021 For example, our confidence Sherpani is an MIT professor of astrophysics. Jill Griffin, Forbes, 2 Nov. 2021 The others — a mix of students and Guild members not affiliated with the university — come from the worlds of bookselling and astrophysics and molecular engineering. Christopher Borrelli,, 23 Dec. 2021 As one of the the most active topics in astrophysics, FRBs have lately seen a slew of groundbreaking and sometimes at-odds findings, with papers that reshape the field regularly appearing in the literature. Adam Mann, Scientific American, 22 Nov. 2021 The Courant spoke with Matt Regala, a senior at the University of Connecticut who majors in physics with a minor in astrophysics, to learn more about the eclipse. Rick Green,, 19 Nov. 2021 Born and raised in Sacramento, Will graduated valedictorian before earning a bachelor of science in astrophysics from University of California, Los Angeles, and her Ph.D. in physics from Arizona State University. Kristy Totten, San Diego Union-Tribune, 2 Nov. 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

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The first known use of astrophysics was in 1870

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Last Updated

6 Jan 2022

Cite this Entry

“Astrophysics.” Dictionary, Merriam-Webster, Accessed 27 Jan. 2022.

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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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