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User:Hftf/Books/Astro/P

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P

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Pair-instability supernova
Parallax
Parsec
Perihelion
Physical cosmology
Planck's law
Planetary nebulae
Pleiades (star cluster)
Polar jet
Pre-main-sequence star
Proper length
Proper motion
Protoplanetary disk
Protostar
Pulsar