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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 seen; its
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NASA
The National Aeronautics and
Space Administration (NASA),
which was established in
1958, is the agency
responsible for the public
space program of the United
States of America. NASA's
vision is "to improve life
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Venus
Venus is the second-closest
planet to the Sun, orbiting
it every 224.7 Earth days.
It is the brightest object
in the night sky, except for
the Moon, reaching an
apparent magnitude of -4.6.
Venus reaches its maximum
... > full story
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
... > full story
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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 ... > 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 -
Transit of Venus
A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and the Earth, obscuring a small portion of the Sun's ... > more -
Neptune's natural satellites
Neptune has 13 known moons. The largest by far is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. It took a hundred years to discover the second, Nereid. ... > more -
Phoenix (spacecraft)
The Phoenix is a planned multi-agency Mars lander, headed by the University of Arizona's Lunar and Planetary Laboratory, under the direction of NASA, scheduled to launch on August 3, 2007. It is a ... > more -
Space Shuttle Columbia
Space Shuttle Columbia (NASA Orbiter Vehicle Designation: OV-102) was the first space shuttle in NASA's orbital fleet. Its first mission, STS-1, lasted from April 12 to April 14, 1981. On February 1, ... > more -
Precession
Precession refers to a change in the direction of the axis of a rotating object. In certain contexts, "precession" may refer to the precession that the Earth experiences, the effects of this type of ... > more -
Deimos (moon)
Deimos is probably an asteroid that was perturbed by Jupiter into an orbit that allowed it to be captured by Mars, though this hypothesis is still in some dispute. Like most bodies of its size, ... > more -
Space exploration
Space exploration is the physical exploration of outer space, both by human spaceflights and by robotic spacecraft. While the observation of objects in space—known as astronomy—pre-dates ... > more
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