Astronomy
Articles about stars, planets, space and the universe.
NGC 3521
NGC 3521 — Flocculent Spiral Galaxy in Leo
NGC 3603-B
NGC 3603-B (HD 97950B): a massive WN6h Wolf–Rayet star
NGC 4102
NGC 4102: Spiral galaxy in Ursa Major
NGC 4526
NGC 4526 — Lenticular galaxy in the Virgo region
NGC 4605
NGC 4605 — a spiral galaxy in Ursa Major
NGC 5907
NGC 6025
NGC 6193
NGC 6302
NGC 6334
NGC 6503
NGC 6503 — a nearby dwarf spiral galaxy in Draco
NGC 6543
NGC 6543 (Cat's Eye Nebula)
NGC 6559
NGC 6559 — a star-forming nebula in Sagittarius
NGC 6946
NGC 6946 (Fireworks Galaxy) — a nearby spiral with frequent supernovae
NGC 7049
NGC 7049 — early-type galaxy with a striking dust ring in Indus
NGC 7090
NGC 7090 — an edge-on spiral galaxy in Indus
NGC 7538
NGC 7538 — Star-forming Nebula in Cepheus
Nix (moon)
Nix (moon) — small irregular satellite of Pluto
NML Cygni
Non-periodic comet
Non-periodic comet (single-apparition and long‑period comets)
Norma
Norma (constellation)
Norma Cluster
Norma Cluster (Abell 3627) — a massive galaxy cluster near the Great Attractor
North America nebula
North America Nebula (NGC 7000)
Nova
Nozomi (spacecraft)
Nozomi — Japan’s early Mars probe (PLANET-B)
OB star
Oberon (moon)
Observable universe
Observatory
Occultation
Occultation (astronomy and general): definition, types, and significance
Octans
Octans — Southern Constellation Marking the South Celestial Pole
Ohzora
Ohzora — Japanese scientific satellite (launched 14 February 1984)
Olympus Mons
Omega Centauri
Omega Centauri (ω Centauri, NGC 5139) — largest globular cluster of the Milky Way
Omega Nebula
Omega Nebula (M17) — the Swan Nebula, a bright H II region
Omniverse
Oort cloud
Open star cluster
Ophelia (moon)
Ophiuchus
Ophiuchus: the Serpent-Bearer constellation
Ophiuchus Supercluster explosion
Ophiuchus Supercluster Explosion: the largest known cosmic eruption