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U8 Glossary

Glossary Unit 8 Pearson Science 7

TermDefinition
Artificial satellites satellites place into orbit by humans
Asteroid an irregular rocky object in orbit around the Sun between the orbits of Mars and Jupiter
Asteroid Belt a group of rocks that orbit the Sun in a band between Mars and Jupiter
Comet a ball of ice, dust and rock that orbits the Sun in a highly elliptical orbit
Gas giants the large planets of the outer solar system: Jupiter, Saturn, Uranus, Neptune
Meteor a meteoroid that enters Earth's atmosphere, usually creating a bright streak across the sky as it burns up; a shooting star
Meteorite a meteor big enough for part of it to hit the ground
Meteoroid a small particle or body of rock that orbits the Sun near Earth's orbit
Milky Way the galaxy in which the solar system is located
Phases different shapes of the Moon as seen from Earth
Solar System the Sun and all the planets, satellites, asteroids, comets and other bodies revolving around it
Terrestrial Earth-like, rocky. The terrestrial plants are Mercury, Venue, Earth and Mars
Astronomer a scientist who studies the stars, planets and other celestial objects
Constellation a group of stars which form a recognisable pattern in the night sky
Dwarf planet a small celestial body that is in orbit around the Sun and is nearly round in shape but with insufficient gravity to sweep its orbit
Geocentric model model of the universe with Earth at its centre
Heliocentric model model of the universe with the Sun at its centre
Retrograde motion apparent loop-like motion of the planets as seen from Earth
Eclipse the total or partial obscuring of one celestial body by another
Ellipse oval shape
Gravitational force field invisible field that causes masses to be attracted to each other
Lunar eclipse when the Earth blocks sunlight from reaching the Moon
Orbit path a planet takes around a star, or a moon or artificial satellite takes around a planet
Penumbra less dense shadow of an eclipse
Satellite object in orbit around another larger object
Solar eclipse when the Moon blocks sunlight from reaching Earth
Tides bulges in the ocean caused by the combined gravitational pull of the Moon and Sun
Umbra full, dark shadow of an eclipse
Axis the line connecting the North Pole with the South Pole. The Earth rotates around this axis
Day the time a planet takes to rotate once completely on its own axis
Revolution one complete orbit around the Sun
Seasons on Earth, summer, autumn, winter, spring; caused by the tilt of a planet's axis
Year the time a planet takes to revolve once around the Sun
Created by: AlexVaccher
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