Unit 7.1 Vocab

Term Definition
Black Hole also know as a singularity, a collapsed star so massive that not even light can escape its gravitational field
Galaxy a large group of stars attached to one another by gravity
Gravitational Lensing the blending of light rays due to the distortion of space caused by a massive object such as a black hole
Gravity the force that causes all matter to collect together
Light Year the distance light travels in a year, about 9,500,000,000,000 km
Milky Way the galaxy in which the solar system is located
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
Nebula a cloud of gas found in the empty space between stars, birthplace of new 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
Protopltary disk disk of gas surrounding a protostar that will form into planets
Proto star a collapsing could of gas that will eventually form into a star
Radiation pressure the force produced by radiation from pressur caused by heat
Stellar Parallax the apparent change in a position of a star throughout the year due to the earths motion around the sun
Super massive black a black hole millions or billions of time the mass of our sun at the center of our galaxy

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