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Space
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Alphabetical index
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Second of arc
(symbol: ") A unit of measurement for very small ...
Seyfert galaxy
Seyfert galaxies are ordinary-looking galaxies, usually ...
Skylab
Skylab was the first American space station. It stayed in ...
Small Magellanic cloud
The Small Magellanic Cloud (SMC) is, like its sister the ...
Solar eclipse of 11 August 1999
On 11 August 1999 there was a total solar eclipse visible ...
Sombrero galaxy
This superb galaxy owes its name to its characteristic ...
Soyuz / ST
Soyuz/ST used a perfected version of the basic Soyuz ...
Soyuz-Fregat
Designed to be cost-effective for medium and high altitude ...
Soyuz-Ikar
Used for the inauguration of Starsem commercial operations, ...
Spica
The Spica star is the main star in the constellation of ...
Sputnik
Sputnik 1 was the first artificial satellite launched from ...
Star system
A star system is a star with its planets, moons, asteroids, ...
Stephan's quintet
Stephan's quintet is a famous group of five galaxies In the ...
Super-Earth
A super-Earth is an exoplanet of which the mass is less than ...
Symbiotic star
Symbiotic stars are binary systems composed of an ordinary ...
