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The Universe Y10-SS

Chapter 7 Pearson Places

TermDefinition
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 centre of mass.
Black hole Also known as a singularity, 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 causes all matter to collect together.
Light-year (l.y.) The distance light travels in a year. Approximately 9 500 000 000 000
Milky Way The galaxy in which the solar system is located.
Nebula A cloud of gas found in the empty space between stars; the 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 l.y.
Protoplanetary disk Disk of gas surrounding a protostar that will form into planets.
Protostar A collapsing cloud of gas that will become a star.
Radiation pressure The force produced by radiation from pressure caused by heat
Stellar parallax The apparent change in position of a star throughout the year due to the Earth's motion around the Sun.
Supermassive black hole A black hole millions or billions of times the mass of our sun found at the centre of a galaxy.
Created by: Hard04