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Space observatory
A space observatory is any
instrument in outer space
which is used for
observation of distant
planets, galaxies, and other
outer space objects. A large
number of observatories have
been launched into orbit,
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Ion thruster
An ion thruster (or ion
drive), one of several types
of spacecraft propulsion,
uses beams of ions -
electrically charged atoms
or molecules - for
propulsion. The precise
method for accelerating the
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Space debris
Space debris or orbital
debris, also called space
junk and space waste, are
the objects in orbit around
Earth created by man that no
longer serve any useful
purpose. They consist of
everything from entire spent
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European Space Agency
The European Space Agency
(ESA), established in 1975,
is an inter-governmental
organisation dedicated to
exploration of space with
currently 17 member states.
ESA has ambitious space
plans that may be divided
... > full story
Browse Reference Articles
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Exploration of Mars
The exploration of Mars has been an important part of the space exploration missions of the Soviet Union (later Russia), the United States, Europe, and Japan. Dozens of unmanned spacecraft, including ... > more -
International Space Station
The International Space Station (ISS) is a joint project of five space agencies. The ISS has seen the first space tourist, Dennis Tito, who spent 20 million USD to fly aboard a Russian supply mission ... > more -
Solid-fuel rocket
A solid rocket or a solid fuel rocket is a rocket with a motor that uses solid propellants (fuel/oxidizer). The earliest rockets were solid fuelled, powered by gunpowder, used by the Chinese in ... > more -
Titan (moon)
Titan, or Saturn VI, is the largest moon of Saturn and the second largest moon in the solar system, after Jupiter's moon Ganymede. It is roughly 50% larger than Earth's moon by diameter, and is ... > more -
Mercury (planet)
Mercury is the innermost and smallest planet in the solar system, orbiting the Sun once every 88 days. It ranges in brightness from about −2.0 to 5.5 in apparent magnitude, but is not easily ... > more -
Astrobiology
Astrobiology is the study of life in space, combining aspects of astronomy, biology and geology. It is focused primarily on the study of the origin, distribution and evolution of ... > more -
Andromeda Galaxy
TThe Andromeda Galaxy (also known as Messier 31, M31, or NGC 224; older texts often called it the Andromeda Nebula) is a spiral galaxy approximately 2.5 million light-years away in the constellation ... > more -
Extraterrestrial life
Extraterrestrial life is life that may exist and originate outside the planet Earth, the only place in the universe currently known by humans to support life. Its existence is currently purely ... > more -
Transit of Venus
A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and Earth, becoming visible against (and hence obscuring a small portion of) the solar disk. During ... > more
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