swap_horiz John Spencer Alternatives
Looking for alternatives to John Spencer? Compare the top Astronomer options ranked by our AI scoring system.
John Spencer
John Spencer is a planetary scientist at Southwest Research Institute, noted for studies of Io's volcanism and work on NASA's 2015 New Horizons Pluto flyby.
apps Top John Spencer Alternatives
The top alternative to John Spencer in 2026 is Nasir al-Din al-Tusi with a score of 8.9/10, followed by David Jewitt (8.9) and Maria Zuber (8.9).
Nasir al-Din al-Tusi
Nasir al-Din al-Tusi (c. 1275 – c. 1315) was a prominent Persian astronomer and mathematician. He established the Maragh...
David Jewitt
David Jewitt is a modern British astronomer specializing in planetary science. His research focuses on the outer solar s...
Maria Zuber
Maria Zuber is a prominent astronomer specializing in geophysics and planetary science. Her work focuses on understandin...
Shrinivas Kulkarni
Shrinivas Kulkarni is a prominent modern astronomer specializing in observational studies of pulsars supernovae and tran...
Giovanni Domenico Cassini
Giovanni Domenico Cassini was a prominent early-modern astronomer renowned for his meticulous observational work. His mo...
Michael Brown
Michael Brown is a modern American astronomer specializing in planetary science. His work significantly advanced our und...
Jane Luu
Jane Luu is an astronomer specializing in modern planetary science. Her research focuses on the outer solar system, part...
Steve Squyres
Steve Squyres is a prominent astronomer specializing in modern planetary science, particularly concerning Mars. He direc...
Alan Stern
Alan Stern is a prominent modern astronomer specializing in planetary science. He spearheaded the New Horizons mission’s...
Clyde Tombaugh
Clyde Tombaugh was an American astronomer whose meticulous work led to the discovery of Pluto in 1930. Utilizing photogr...
Michael E. Brown
Michael E. Brown is an American planetary astronomer whose 2005 discovery of Eris helped trigger Pluto's reclassificatio...
Imke de Pater
Imke de Pater is a Dutch planetary scientist at UC Berkeley, known for radio and infrared studies of giant planets and K...
Ole Rømer
Danish astronomer who in 1676 made the first quantitative measurement of the speed of light by observing timing variatio...
Gan De
Gan De was an ancient Chinese astronomer who lived during the 4th century BCE. His meticulous observations of celestial...
Jean-Luc Margot
Jean-Luc Margot is a Belgian-born UCLA planetary astronomer, noted for radar studies of asteroids and the 2007 evidence...
Marc Buie
Marc Buie is an American astronomer at Southwest Research Institute, noted for Pluto studies and co-discovering its moon...
Scott S. Sheppard
Scott S. Sheppard is an American astronomer who has discovered many outer Solar System bodies, including the distant obj...
Asaph Hall
American astronomer who in 1877 discovered the two moons of Mars, Phobos and Deimos, using the 26-inch refractor at the...
Katherine de Kleer
Katherine de Kleer is an American planetary scientist whose Keck, Gemini, and ALMA work studies Io's volcanism and atmos...
Marc W. Buie
Marc W. Buie, an American astronomer at the Southwest Research Institute, has studied Pluto, the Kuiper belt, and New Ho...
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