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7.1 Vocab
Words from chapter 7.1 Science
Word | Definition |
---|---|
Accretion | The process in which particles of rock and dust come together due to gravity to form a larger object |
Binary star system | two stars that orbit a centre of mass |
Black Hole | collapsed star so massive not even light can escape its gravitational feild |
Galaxy | Large group of stars attracted to each other by gravity |
Gravity | The force that causes all matter to collect together |
Light-year | The distance light travels in a year |
Milky Way | The Galaxy in which the Solar System is |
Nebula | Cloud of gas found i empty space between stars; birthplace of new stars |
Nuclear Fusion | The process of hydrogen turning into helium, producing light and heat |
Parallax | A technique used to measure distance to other stars |
Parsec | Astronomical unit of length - 3.26 l.y |
Protoplanetary disk | disk of gas surrounding protostar that will turn into planets |
Protostar | Collapsing cloud of gas that will become a star |
Radiation pressure | Force produced by radiation from pressure caused by heat |
Stellar Parallax | apparent change of position of a star due to earth's rotation around the sun |
Supermassive Black Hole | Black hole millions or billions times the mass of our sun found at the centre of galaxies. |