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17 Cards in this Set
- Front
- Back
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The _____________ is a large ____________ galaxy whose disk is about 100,000 light-years wide and about 10,000 light-years thick at the nucleus.
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milkyway, spiral
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The ________ of distant galaxies indicate that the universe is expanding.
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redshift
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______________ states that galaxies are retreating from Earth at a speed that is proportional to their distance from Earth.
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Hubble's law
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According to the __________________ the universe is about 13.8 billion years old.
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big bang theory
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Scientists categorize galaxies with no definite shape as an _______________ galaxy.
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irregular
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A star that is moving toward Earth will give off a shorter wave length called a ____________.
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blue shift
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jupiter, saturn, uranus, and neptune can be called the ______________ planets or the _______________.
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jovian, outer planets
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Our ______________ revolves and rotates around our sun.
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solar system
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Earth, mars, mercury, and venus can be called the ____________ planets or the ______________.
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terestrial, inner planets
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The _____________ includes our solar system and all the other solar systems that exist.
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universe
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Galaxies are classified accordingly to their shape. The 3 main types are spiral, irregular and ____________.
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eliptical
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The _____________ is the apparent change in light waves caused be motion of a source compared to an observer.
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doppler effect
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The galaxy cluster called the ______________ is what the milky way galaxy belongs to.
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local group
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A group of stars (billions) dust, and gases held together by gravity is called a ____________.
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galaxy
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The _______________________ is approximately 13-14 billion years old.
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age of the universe
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The study of the universe and everything in it is known as _______________.
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astronomy
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The redshifts of distant galaxies describes the ________________.
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expanding universe
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