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7.1 Glossary

Accretion The process in which particles of dust and rock slowly come together due to gravity to form a larger object
Binary Star System Two stars that orbit a common center of mass
Black hole A collapsed star so massive that not even light can escape from its gravitational field
Galaxy A large group of stars attracted to one another by gravity
Gravitational lensing The bending of light rays due to the distortion of space caused by a massive object such as a black hole
Gravity The force that cause all matter to collect together
Light-year The distance light travels in a year
Milky Way The Galaxy in which the solar system is located
Nebula A cloud of gas found in empty space between stars
Nuclear Fusion The process in which hydrogen is converted into helium to produce light and heat
Parallax A technique used to measure the distance to other stars
Parsec An astronomical unit of length equal to 3.26 light years
Protoplanetary Disk Disk of gas surrounding a Protostar that will form into planets
Protostar A collapsing cloud of gas that will eventually become a star
Radiation pressure The force produced by radiation from pressure caused by heat
Stellar Parallax The apparent change in the position of a star throughout the year due to the Earths motion around the sun
Super-massive Black Hole A black hole millions or billions of times the mass of our Sun found at the center of a galaxy
Created by: KHOO02