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- Rotanev Rotanev: A Stellar Name with a Twist In the vast tapestry of the night sky, st… Stellar Astronomy
- Rotation Spinning Stars: Understanding Rotation in Stellar Astronomy The vast expanse o… Stellar Astronomy
- Rowland, Henry Augustus Henry Augustus Rowland: A Pioneer in Solar Spectroscopy Henry Augustus Rowland… Astronomers
- Runcorn, S. Keith S. Keith Runcorn: A Pioneer in Paleomagnetism and Planetary Magnetism S. Keith… Astronomers
- Russell, Henry Norris Henry Norris Russell: Charting the Stellar Universe Henry Norris Russell, a to… Astronomers
- Rutherfurd, Lewis Morris Lewis Morris Rutherfurd: A Lawyer Turned Astronomer Lewis Morris Rutherfurd (1… Astronomers
- Ryle, Sir Martin Sir Martin Ryle: A Pioneer of Radar and Radio Astronomy Sir Martin Ryle, born … Astronomers
- Sadachbia Sadachbia: A Tale of Two Stars in Aquarius The celestial tapestry is woven wit… Stellar Astronomy
- Sadalmelik Sadalmelik: The "Good Fortune of the King" In the celestial tapestry, stars ho… Stellar Astronomy
- Sadalsund Sadalsuud: The Star of Fortunes In the vast expanse of the night sky, constell… Stellar Astronomy
- Sagan, Carl Carl Sagan: A Visionary Who Brought the Cosmos to Earth Carl Sagan, a name syn… Astronomers
- Sagittarius (the Archer) The Archer: Sagittarius, a Constellation of Stars and Stories Sagittarius, t… Constellations
- Sagitta (the Arrow) Sagitta: The Little Arrow Piercing the Night Sagitta, Latin for "arrow," is … Constellations
- Saros The Saros: Unveiling the Secrets of Eclipses The heavens have always held a po… Solar System Astronomy
- Satellites The Celestial Dance: Satellites in Stellar Astronomy In the grand theatre of t… Stellar Astronomy
- Saturn Saturn: The Jewel of the Solar System Saturn, the second largest planet in our… Solar System Astronomy
- Schedir Schedir: The Variable Star at the Heart of Cassiopeia Schedir, a name sometime… Stellar Astronomy
- Scheiner, Christoph Christoph Scheiner: Sunspots, Controversy, and Galileo's Downfall Christoph Sc… Astronomers
- Schiaparelli, Giovanni Virginio Schiaparelli: The Man Who Saw Canals on Mars Giovanni Virginio Schiaparelli, b… Astronomers
- Schlesinger, Frank Frank Schlesinger: A Pioneer in Stellar Parallax Frank Schlesinger (1871-1943)… Astronomers
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