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Gravity - Space Exploration

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Term
Definition
Gravity   The force that causes objects with mass to attract one another.  
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Gravitational Attraction   The force that pulls two objects towards each other; the greater the mass of and object, the greater the attraction; the further apart the objects, the weaker the attraction.  
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Newton’s Law of Universal Gravitation   The law that says every object in the universe attracts every other object, and that the force is affected by mass and distance: the greater the mass of an object, the greater the attraction; the farther apart the objects, the weaker the attraction.  
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Mass   The amount of matter in an object  
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Space Exploration   The investigation of physical conditions in space and on stars, planets, and other celestial bodies through the use of satellites, space probes, or spacecraft with human crews.  
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Rocket   An engine that provides thrust directly through the burning of its fuel without requiring the intake of air.  
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Spacecraft   A vehicle or device designed for travel or operation outside Earth’s atmosphere.  
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Space Shuttle   A reusable spacecraft designed to transport people and cargo between Earth and space.  
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Space Probe   An unmanned spacecraft designed to explore the solar system and transmit data back to Earth.  
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Rover   A vehicle for exploring the surface of an extraterrestrial body (such as the Moon and Mars).  
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Satellite   Something that orbits around another object; for example, a moon orbiting a planet or a human-made object orbiting Earth.  
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Telescope   An instrument for viewing or detecting distant objects.  
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Observatory   A building or place given over to or equipped for observation of natural phenomena.  
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International Space Station   An orbiting space satellite, construction of which began in 2001 with the cooperation of 16 nations; used for scientific and space research.  
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Galileo Galilei   The father of modern science; made improvements to the telescope and discovered the four largest moons of Jupiter, among many other scientific accomplishments.  
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Astronauts   A person trained to be part of a spacecraft crew  
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NASA   National Aeronautics and Space Administration; the American governmental agency dedicated to space exploration.  
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