Page 20 - Universe dictionary by Futura-Sciences

Alphabetical index

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 ...	P80 P80 is the first stage of the Vega launcher. It is composed ...
Pallasite Pallasites are mixed meteorites in which olivine crystals ...	Pan Pan (Saturn XVIII) was discovered by Mark R.Showalter in ...
Panspermia Panspermia: Historically, panspermia was a theory according ...	Parallax A parallax is a periodic shift in the apparent positions of ...
Parasol Parasol is the second micro-satellite in the Myriade line ...	Parsec A parsec is the distance at which a star must be to have a ...