Planets & Stellar Astronomy 1-24
19 entries in the Planets & Stellar Astronomy compendium.
ParallaxParallax measures distance through apparent shift in viewpoint.ParsecUnit of distance defined by one arcsecond of parallax.Planetary nebulaExpanding shells of ionized gas from dying stars.Planetary systemA star's family of orbiting worlds and debris.PleiadesA nearby open star cluster visible to the naked eye.ProtostarEarliest phase of stellar evolution, gathering mass from a molecular cloud.PulsarRotating neutron stars emitting regular electromagnetic pulses.Red giantA late-phase, luminous giant star with an inflated atmosphere.Ring NebulaPlanetary nebula in Aquarius discovered by Karl Ludwig Harding, most likely before 1824.Solar SystemThe Sun and all objects gravitationally bound to it.Star clusterGroups of stars sharing origin, held by gravity.Star formationProcess by which dense molecular cloud regions collapse into stars.Star systemGravitationally bound groups of stars, from binaries to complex multiples.Stellar black holeBlack holes formed from stellar collapse.Stellar classificationSystem for classifying stars by spectral and luminosity characteristics.Stellar evolutionStars evolve from gas clouds to white dwarfs, neutron stars, or black holes.Stellar kinematicsObservational study of star motions through space.Stellar magnetic fieldMagnetic fields generated by plasma motion shape stellar activity.Stellar structureModels describing internal star structure and energy transport.
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