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OB association
The OB association is a loose group of a few dozen or ...
Oberon
A satellite of Uranus. Oberon (Uranus IV) was discovered by ...
Objective
An objective is the light-collecting part of a telescope.The ...
Obliquity
Obliquity is the angle between a body's equatorial plane and ...
Occultation
Occultation occurs when one celestial body passes behind ...
OCO
OCO (Orbiting Carbon Observatory) was a satellite that ...
Oort cloud
The Oort cloud is a sphere (and not a ring) formed from ...
Open cluster
An open star cluster usually contains several hundreds of ...
Opportunity
Opportunity is the second rover in the NASA MER mission ...
Optical doublet
An optical doublet is a combination of two lenses with ...
Orange dwarf
An orange dwarf is a star of a brightness between that of ...
Orbit
The curved path taken around the Sun by a planet, or by a ...
Orbiter
An orbiter is a space probe that remains in orbit around a ...
Orbitography
Orbitography is the study of satellite orbits. A knowledge ...
Orion
The constellation of Orion is a constellation in the winter ...
Ozonosphere
The ozonosphere is the part of the atmosphere between 15 and ...
