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# 0E-Gravity n Space

### 0E-Gravity, Solar System, Galaxies

TermDefinition
acceleration due to gravity every second, an object will be traveling 9.8 m/s faster than it was a second ago (Earth = 9.8 m/s/s (or) 9.8 m/s2)
escape velocity the lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object.
force a push or pull that can change the motion of an object
gravity the force that causes objects with mass to attract one another
inertia the tendency of an object to resist a change in motion
interacting objects objects that affect one another
magnitude size or amount of something
mass a measure of how much matter is in a substance
Newton SI unit of measurement for weight
orbit a curved path followed by an object as it revolves around another object
period of revolution amount of time it takes a body to revolve around another body
revolution a celestial body going around another in an orbit
SI International System of Units (Système Internationale) that lists the standard units of measurement to be used world-wide
terminal velocity the constant speed a falling object reaches when it cannot accelerate any further due to resistance
vector an arrow that shows both direction and magnitude (force arrow for example)
velocity speed with direction
weight the heaviness of an object – how much gravity is pulling on an object’s mass
accretion growing in size due to the gradual accumulation of layers
asteroid large and small rocks or metallic masses orbiting the sun
asteroid belt the space between the orbits of Mars and Jupiter in which most asteroids are found
Big Bang Theory a theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago
dust tiny particles of matter floating in space, condenses under gravity to form stars and planets
galaxy a large grouping of stars in a space
gas a form of matter with indefinite shape and volume
kuiper belt a region beyond the orbit of Neptune believed to contain many comets, asteroids, and other small bodies made largely of ice
kuiper belt object small bodies orbiting the Sun in the Kuiper Belt
Milky Way a spiral galaxy that contains our Solar System along with several hundred billion stars
model a three-dimensional representation of something, typically on a smaller scale than the original
moon a celestial body that revolves around a planet
planet any of the large celestial bodies that revolve around the Sun in the solar system
satellite a natural or artificial body in orbit around Earth or another planet
scale an accurate representation of something which has been either reduced or enlarged from its original size keeping the proportions accurate
solar system the Sun and the planets and other celestial bodies that are held by their gravitational attraction and revolve around the Sun
stellar system a star with one or more objects in orbit around it – (the second object could be another star, multiple stars, planets, etc.)
sun the luminous star around which Earth and other planets revolve; composed mainly of hydrogen and helium

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