NASA - National Aeronautics and Space Administration
The National Aeronautics and Space Administration (NASA) is an agency of the United States federal government, responsible for the nation's public space program. Established on July 29, 1958, by the National Aeronautics and Space Act
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EU Space Program
The European Space Agency (ESA), established in 1975, is an inter-governmental organization dedicated to the exploration of space, currently with 17 member states. Its headquarters are in Paris, France.
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Hubble Telescope
The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble. Its position outside the Earth's atmosphere provides significant advantages over ground based telescopes - images are not blurred by the atmosphere, there is no background light scattered from the atmosphere, and the Hubble can observe in ultra-violet light that is absorbed by the ozone layer.
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Satellites
A satellite is any object that orbits another object (which is known as its primary). Satellites can be spacecraft manufactured on Earth and sent into orbit on a launch vehicle, they may be naturally occurring such as moons, comets, asteroids, planets, stars, and even galaxies, or they may be space debris.
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