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13 Cards in this Set
- Front
- Back
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What are astronomers?
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people who study space
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What is the Big Bang theory?
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the theory that proposes that the universe formed approximately 13.7 billion years ago when an unimaginably tiny volume of space rapidly expanded to immense size
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What are celestial bodies?
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all the objects in space, including the Sun, the Moon, planets and stars
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What is cosmological red shift?
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wavelengths of radiated light that are being constantly stretched (lengthened) as the light crosses the expanding universe
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What is electromagnetic radiation?
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energy that is carried, or radiated, in the form of waves that range in length from short to long
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What is an elliptical galaxy?
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one of the three basic galaxy shapes; a galaxy that ranges in shape from a perfect sphere to an elongated but flattened eclipse and contains some of the oldest stars in the universe
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What is an irregular galaxy?
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one of three basic galaxy shapes; a galaxy that has neither spiral arms nor an obvious central core, made up of a mix of newly forming stars and old stars
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What is a nebula?
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a cloud of gas and dust in space
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What is red shift?
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a shifting of light from an object toward the red (longer wavelength) end of the spectrum as the object moves away from Earth
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What is a spectroscope?
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an optical instrument that acts like a prism to separate light into its basic component colors
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What is a spectrum?
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the band of rainbow colors created when white light passes through a prism; each color of the spectrum represents different wavelengths of light
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What is a spiral galaxy?
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one of three basic galaxy shapes; a galaxy with many "long" arms spiralling out from a centre core made up of stars that formed long ago
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What are star clusters?
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distinct formations of stars in a galaxy; the two types are open clusters and globular clusters
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