planetary nebula
121Compact star — In astronomy, the term compact star (sometimes compact object) is used to refer collectively to white dwarfs, neutron stars, other exotic dense stars, and black holes. These objects are all small for their mass. The term compact star is often… …
122NGC 2346 — For other uses of Butterfly Nebula , see Butterfly Nebula (disambiguation). NGC 2346 Observation data (Epoch J2000.0) Right ascension 07 …
123NGC 7008 — NGC 7008, the Fetus Nebula Observation data (Epoch J2000) Right ascension 21h 00m 32.503s …
124Astronomy — (from the Greek words astron (ἄστρον), star , and nomos (νόμος), law ) is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth s atmosphere (such as the cosmic… …
125Aquila (constellation) — Infobox Constellation name = Aquila abbreviation = Aql genitive = Aquilae symbology = the Eagle RA = 20 dec= +5 areatotal = 652 arearank = 22nd numbermainstars = 8 numberbfstars = 65 numberstarsplanets = 4 numberbrightstars = 3 numbernearbystars …
126NGC 3918 — A Hubble Space Telescope image of NGC 3918. Credit: ESA/Hubble and NASA. Observation data (Epoch J2000.0) …
127NGC 6826 — A Hubble Space Telescope (HST) image of NGC 6826. Credit: HST/NASA/ESA. Observation data (Epoch J2000) …
128Extragalactic distance scale — The extragalactic distance scale is a series of techniques used today by astronomers to determine the distance of cosmological bodies (beyond our own galaxy) not easily obtained with traditional methods. Some procedures utilize properties of… …
