• Jacobi polynomial
• jagged peak
• jalousie
• James Clerk Maxwell telescope
• jansky
• jaw
• jet
• Jet Propulsion Laboratory
• jet stream
• jet-stream
• jiggle photometer
• jitter
• jj-coupling
• jj-
• jl-coupling
• jl-
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• Jodrell Bank
• Johnson-Morgan photometric system
• Johnson noise
• Johnson Space Center
• Josephson junction detector
• Journal of British Astronomical Association
• journey
• Jovian
• Jovian burst
• Jovian emission
• Jovian exosphere
• Jovian family
• Jovian ionosphere
• Jovian magnetic field
• Jovian radiation
• Jovian radio outburst
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• joviocentric coordinates
• Julian calendar
• Julian date
• Julian day
• Julian period
• Julian year
• jump
• jump in brightness
• jumping electron
• jumping film
• jumping-film camera
• jumping plate
• jumping-plate camera
• Jupiter's family
• Jupiter's moons
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