Chatty 008 HotSpots & Intermediate VocabBox & Glossary & Vocabulary Double-Check: How Big is the Universe?

UNIVERSE: all existing matter, energy, and space
human mind: the faculty of original or creative thought; imagination
conceive: develop or form in the mind
the earth: the third planet from the sun; the only planet on which life is known to exist
the solar system: the system containing the sun and the bodies held in its gravitational field, including the planets [Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto], the asteroids, and comets
the sun: the star that is the source of heat and light for the planets in the solar system
the planets: any one of the nine celestial bodies that revolve around the sun in elliptical orbits, and are illuminated by light from the sun
revolve: move around a centre
the asteroids: any of numerous celestial bodies that move around the sun mainly between the orbits of Mars and Jupiter
meteor: a celestial body that travels around the sun, usually in a highly elliptical orbit; it consists of a solid frozen head, and a long luminous tail
a galaxy: any of a vast number of star systems that are held together by gravitational attraction
the Milky Way: the diffuse band of light stretching across the night sky that consists of millions of stars
light year: a unit of distance used in astronomy, equal to the distance travelled by light in one year
6,000,000,000,000: six million million; formerly [in Britain] six billion
bright: emitting or reflecting much light
Alpha Centauri: a binary [double] star that is the brightest in the constellation Centaurus
25,000,000,000,000: twenty-five million million; formerly [in Britain] twenty-five billion
expand: make or become greater in extent, volume, or size
far apart: separate in time, place, or position; at a great distance

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