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Ch 11 '14

Galaxies are cool in life

TermDefinition
asteroid Small rocky bodies in our solar systems, most of which orbit the Sun Mars and Jupiter.
axis An imaginary line through Earth, extending from the North pole to the South Pole.
black hole A large sphere of incredibly tightly packed material with an extraordinary amount of gravitational pull created when a star collapses into itself. Not even light can escape it.
comet A small body made up of rocky material and ice that occurs in the Kuiper Belt and the Oort Cloud; when a comet is bumped into the inner solar system, the Sun's light may make the comet's tail visible from earth.
Doppler effect The change in wavelengths of electromagnetic radiation or sound that occurs because of the movement of the source relative to the observer.
fusion The process in which the nuclei of atoms fuse together to form larger single atoms, creating an enormous amount of energy.
interstellar matter The material that fills space, made up of gas( mostly hydrogen)and dust.
light-year The distance that light which moves at 300000km/sec, travels in a year; equals about 9.5 trillion km.
moon Celestial bodies that orbit a planet.
parallax the apparent shift of an object against a stationary background caused by a change in the position of the observer.
planet A celestial planet that orbits one or more stars, is large enough that its own gravity holds its spherical shape and is the only body occupying the orbital path.
revolution The motion of earth as it orbits the Sun.
rotation The motion of Earth as it spins on its axis from west to east.
solar system A group of planets circling one or more stars.
star A celestial body of hot gases with a core like a furnace that makes its own thermal energy.
supernova A dramatic, massive explosion that occurs when a large, high mass star collapses in on itself.
triangulation A technique for determining the distance to a visible object by creating an imaginary triangle between the observer and the object and then calculating the distance.
Created by: mddai
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