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- Altitude : Distance above a planetary reference point, such as the mean sea level.
- Apollo Command-Service Module : Three-man spacecraft built for NASA by North American Aviation, and one of the two spacecraft that were utilized for the Apollo program, along with the Lunar Module, to land astronauts on the Moon.
- Astronomy : The study of objects and processes in the observable universe, e.g. stars, planets, comets or asteroids.
- Big Bang : A cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature.
- Christiaan Huygens : (14 April 1629 - 8 June 1695) an internationally renowned Dutch mathematician, physicist and astronomer.
- Cosmology : A branch of astronomy and of metaphysics committed to the study of the universe as a whole, of the contents, structure, and evolution of the universe from the beginning of time to the future.
- Electromagnetic spectrum : The range of electromagnetic waves covering all frequencies and wavelengths.
- GALEX : An orbiting ultraviolet space telescope that was launched on April 28, 2003.
- Galaxy : Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Galaxy (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
- Galileo Galilei : (1564-1642) Italian scientist, a pioneer in combining mathematical theory with systematic experiment in science, who came into conflict with the Church.
- Gravitational lens : A lens formed when light from a very distant, bright source (such as a quasar) is 'bent' around a massive object (such as a cluster of galaxies) between the source object and the observer.
- Hubble Space Telescope : A telescope in orbit around the Earth that has made many important astronomical observations.
- Kilometre : An SI unit of length, equal to 1000 metres, commonly used for measuring distances on the earth's surface.
- Mars (planet) : The fourth planet from the Sun in our solar system; named after the Roman god of war; also known as the "Red Planet".
- Microscope : An instrument that magnifies the image of small objects such that they become observable by humans.
- Mile : A non-SI unit of length, equal to 1.609 kilometres, and equivalent to 5,280 feet.
- Physics : The study of forces and energies in space and time.
- Project Muse : A subscription-based academic journals site operated by the Johns Hopkins University Press.
- Satellite : An object that travels in orbit around a more massive body.
- Saturn (planet) : The sixth planet from the Sun in our solar system; named after the Roman god of agriculture and harvest.
- Space debris : Man-made objects in earth orbit that no longer serve any useful purpose.
- Spacecraft : Vehicle designed to operate, with or without a crew, for use beyond the Earth's atmosphere.
- Tycho Brahe : Danish astronomer of the 16th century.
- Ultraviolet : The part of the electromagnetic spectrum between the visible light and X-ray regions
- Uranus (planet) : The seventh planet from the Sun in our solar system; name after the Greek god of the sky.
- Venus (planet) : The second planet from the Sun in our solar system; named after the Roman goddess of love.
- Visible light : Electromagnetic radiation of a wavelength that is detectable by the human eye.
- Wisconsin Ultraviolet Photo-Polarimeter Experiment : One of three ultraviolet telescopes on the ASTRO-1 mission flown on the space shuttle Columbia during December, 1990.