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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
... > full story
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
... > full story
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
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 disc. ... > full story
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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 -
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 -
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 -
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 -
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 -
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 -
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 -
Uranus' natural satellites
Uranus has 27 known moons. The first two moons (Titania and Oberon) were discovered by William Herschel on March 13, 1787. Two more moons (Ariel and Umbriel) were discovered by William Lassell in ... > more
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