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Aberration
In physics, an optical system is said to have an aberration ...
Active galaxy nucleus
Active Galactic Nuclei(AGN) are particularly bright galactic ...
Aldebaran
Aldebaran is the brightest star in the constellation of ...
Analemma
The analemma is a figure obtained by juxtaposing the ...
Andromeda galaxy
The MESSEIR 31 galaxy - the Andromeda galaxy - is one of the ...
Aperture synthesis
Aperture synthesis is a method using radiating elements or ...
Arend-Roland comet
On 8 November 1956, two astronomers from the Royal Belgian ...
Arp's loop
Arp's loop (from the name of its discoverer Halton Arp) is a ...
Asteroid belt
The asteroid belt lies between the orbits of Mars and ...
Asymptotic giant branch
The Asymptotic giant branch, AGB, is part of the evolutive ...
