Term | Definition |
Gravity | The force that causes objects with
mass to attract one another. |
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. |
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. |
Mass | The amount of matter in an object |
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. |
Rocket | An engine that provides thrust directly through the
burning of its fuel without requiring the intake of air. |
Spacecraft | A vehicle or device designed for travel or
operation outside Earth’s atmosphere. |
Space Shuttle | A reusable spacecraft designed to transport
people and cargo between Earth and space. |
Space Probe | An unmanned spacecraft designed to explore the
solar system and transmit data back to Earth. |
Rover | A vehicle for exploring the surface of an
extraterrestrial body (such as the Moon and Mars). |
Satellite | Something that orbits around another object; for
example, a moon orbiting a planet or
a human-made object orbiting Earth. |
Telescope | An instrument for viewing or
detecting distant objects. |
Observatory | A building or place given over to or
equipped for observation of natural phenomena. |
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. |
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. |
Astronauts | A person trained to be part of a spacecraft crew |
NASA | National Aeronautics and Space
Administration; the American governmental
agency dedicated to space exploration. |