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- Jansky, Karl Guthe The Man Who Heard the Milky Way: Karl Jansky and the Dawn of Radio Astronomy I… Astronomers
- Janssen, Pierre Jules César Pierre Jules César Janssen: A Pioneer of Solar Astronomy Pierre Jules César Ja… Astronomers
- Japetus Japetus: Saturn's Mysterious Moon Japetus, the third largest moon of Saturn, s… Solar System Astronomy
- Jeans, Sir James Hopwood Jeans, Sir James Hopwood: A Pioneer in Stellar Constitution Sir James Hopwood … Astronomers
- Jeffreys, Sir Harold Beyond the Earth: Sir Harold Jeffreys, the Geophysicist who Shaped Our Understa… Astronomers
- Jones, Sir Harold Spencer Sir Harold Spencer Jones: A Stellar Legacy Sir Harold Spencer Jones (1890-1960… Astronomers
- Jovicentric Jovicentric: A View from Jupiter's Throne In the vast cosmic theatre, our sola… Solar System Astronomy
- Julian Calendar The Julian Calendar: A Foundation for Stellar Astronomy The Julian calendar, n… Stellar Astronomy
- Julian Period The Julian Period: A Universal Timekeeper for Stellar Astronomy The vastness o… Stellar Astronomy
- Juno Juno: A Giant in the Asteroid Belt Juno, a minor planet nestled between Mars a… Solar System Astronomy
- Jupiter King of the Planets: Exploring Jupiter's Majesty Jupiter, the largest planet… Solar System Astronomy
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