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Iapetus
Iapetus (Saturn VIII) was discovered by Cassini in 1671. Its ...
IATA
IATA (International Air Transport Association) An ...
Ikonos
Ikonos was an American observation satellite weighing around ...
Impactor
An impactor is an object striking a celestial body (planet, ...
Inclination
Inclination is the angle between the plane of the orbit of a ...
Instrumental aberration
In optics, instrumental aberration covers all the phenomena ...
Interaction
(or force) To explain the behaviour of matter, four forces ...
International Astronomical Union
The International Astronomical Union (IAU) was founded in ...
Interstellar cloud
An interstellar cloud is the environment in which solar ...
Interstellar dust
Interstellar dust is specks of matter floating in space ...
Io
Io was discovered by Galileo in 1610 while he was observing ...
Ion engine
An ion engine is an engine driven by accelerated ions, as ...
Ionosphere
The ionosphere is the region of the atmosphere where the ...
Irregular galaxy
An irregular galaxy is a galaxy that does not have a spiral ...
ISRO
Indian Space Research Organisation, ISRO.
