An astronomer whose observations of aberration of light provided evidence for the motion of Earth and a finite speed of light.
Portrait of James Bradley
. Public-domain historical engraving, hosted by Wikimedia Commons. Source.An astronomer whose work includes the primordial Earthshine hypothesis for the lunar crustal dichotomy.
Portrait of Arpita Roy
. External portrait hosted by Space Telescope Science Institute. Source.Astronomer (1473–1543) whose 1543 book placed Earth among planets orbiting the Sun. The heliocentric model altered the geometric organization of planetary motion.
Portrait of Nicolaus Copernicus
. Unknown painter, circa 1580 portrait in the Town Hall museum at Toruń; faithful reproduction. Public domain (Commons PD-Art, author life+100; U.S. faithful-reproduction position stated). Source and usage information on the linked Wikimedia file page. Source.
Lunar-model diagram attributed to Ibn al-Shatir
. Lunar-model diagram attributed on Commons to Ibn al-Shatir, dated there to the fourteenth century; reproduction from CCVALG, uploaded by Viaros17. Public domain in its source country and in the United States, according to the linked file page. Source..jpg?width=260)
Portrait of Nasir al-Din al-Tusi
. Artwork by Kh. Mirsoyev; Azermarka, Azerbaijan commemorative stamp (2001); existing Commons crop. Public domain (official postage stamp; Commons PD-AZ-exempt). Source and usage information on the linked Wikimedia file page. Source.
Portrait of Ptolemy
. Unknown engraver, in André Thevet, Les vrais portraits et vies des hommes illustres (1584), folio 87; scan via UQAM. Public domain (PD-Art, life+100/pre-1931 publication). Source and usage information on the linked Wikimedia file page. Source.Radio astronomer and first author of a Very Long Baseline Array solar-deflection measurement published in 2009.
An astrophysicist studying stellar black holes and X-ray binaries.
Portrait of Avishai Dekel
. דאגלס גוטרי (author as credited on Commons). CC BY-SA 3.0, via Wikimedia Commons. Source.
Portrait of Andrew Fabian
. Thomas Barstad Eckhoff, credited as Thomas Eckhoff; published by The Kavliprize. CC BY-SA 2.0, via Wikimedia Commons. Source.
Portrait of Hagai Netzer
. Via Wikimedia Commons; credits and usage information are on the linked source file page. Source.
Portrait of Frank Shu
. SSR2000, own photograph, 19 October 2013. CC BY-SA 3.0, via Wikimedia Commons. Source.
Portrait of Luis C. Ho
. External portrait hosted by Kavli Institute for Astronomy and Astrophysics, Peking University. Source.
Portrait of Karen L. Masters
. Via Wikimedia Commons; credits and usage information are on the linked source file page. Source.
Portrait of Michael Dopita
. External portrait hosted by Australian Academy of Science. Source.
Portrait of R. Paul Butler
. NASA Astrobiology Institute. Public domain (NASA). Source usage terms, via Wikimedia Commons. Source.
Portrait of Geoffrey W. Marcy
. Laurie Hatch (embedded EXIF author); Commons summary credits NASA / Media Telecon. Via Wikimedia Commons; credits and usage information are on the linked source file page. Source.
Portrait of Dimitar Sasselov
. External portrait hosted by Harvard University Department of Astronomy. Source.
Portrait of James B. Pollack
. NASA/Ames Research Center. Public domain in the United States (NASA work, as marked on Commons), via Wikimedia Commons. Source.
Portrait of Sara Seager
. NASA/Joel Kowsky. Public domain (NASA). Source usage terms, via Wikimedia Commons. Source.- Mass-radius relationships for solid exoplanets by Sara Seager and others
- On the Unique Solution of Planet and Star Parameters from an Extrasolar Planet Transit Light Curve by Sara Seager and Gabriela Mallén-Ornelas
- Theoretical Transmission Spectra During Extrasolar Giant Planet Transits by Sara Seager and Dimitar Sasselov
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Portrait of Martin Rees
. IAU/B. Tafreshi (twanight.org). CC BY 4.0, via Wikimedia Commons. Source.
Portrait of Simon White
. Photograph by Mike Peel (www.mikepeel.net). CC BY-SA 4.0, via Wikimedia Commons. Source.
Portrait of Juri Toomre
. External portrait hosted by JILA, University of Colorado Boulder. Source.
Portrait of Alar Toomre
. Via Wikimedia Commons; credits and usage information are on the linked source file page. Source.
Portrait of Scott M. Ransom
. External portrait hosted by National Radio Astronomy Observatory, astronomer homepage. Source. Articles were limited to the first 100 out of 181 total.
Articles by others on the same topic
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An astronomer is a scientist who studies celestial objects, such as stars, planets, moons, galaxies, and the universe as a whole. They seek to understand phenomena that occur beyond Earth's atmosphere, including the origins, evolution, and eventual fate of these celestial bodies and the universe itself. Astronomers use various methods and tools, including telescopes, satellites, and computer models, to collect data and analyze the properties and behaviors of astronomical objects.