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25 Cards in this Set
- Front
- Back
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A smaller, usually nonluminous body orbiting a star.
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planet
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An increase in the mass of a body by accumulation or clumping of smaller particles.
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accretion
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The name of our galaxy. Sometimes applied to the field of stars in our home spiral arm, which is correctly called the Orion arm.
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Milky Way Galaxy
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The hypothetical event that started the expansion of the universe from a geometric point. The beginning of time.
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Big bang
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The initial formation of life on Earth
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biosynthesis
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A large construct explaining events in nature that have been observed to occur with unvarying uniformity under the same conditions.
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law
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A speculation about the natural world that may be verified or disproved by observation and experiment.
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hypothesis
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Test that simplify observation in nature or in the laboratory by manipulating or controlling the conditions under which observations are made.
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experimen
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The explosive collapse of a massive star.
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supernova
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The formation of layers in a material, with each deeper layer being denser (weighing more per unit of volume) than the layer above.
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density stratification
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Premise that stars and planets accumulate from contracting, accreting clouds of galactic gas, dust, and debris.
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condensation theory
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The volcanic venting of volatile substances.
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outgassing
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A large rotating aggregation of stars, dust, gas, and other debris held together by gravity. There are perhaps 50 billion galaxies in the universe and 50 billion stars in each galaxy.
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galaxy
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Diffuse cloud of dust and gas.
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nebula
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The process (or result) of applying the scientific method to the ocean, its surroundings, and the life forms within it. Also called oceanography or oceanology.
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marine science
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The science of the ocean. See also marine science
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oceanography
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(1) The great body of saline water that covers 70.78% of the surface of Earth. (2) One of its primary subdivisions, bounded by continents, the equator, and other imaginary lines.
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ocean
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Tightly condensed knot of material that has not yet attained fusion temperature
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protostar
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A systematic way of asking questions about the natural world and testing the answers to those questions.
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science
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The sun together with the planets and other bodies that revolve around it.
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solar system
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The diffuse cloud of dust and gas from which the solar system originated.
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solar nebula
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The orderly process by which theories explaining the operation of the natural world are verified or rejected.
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scientific method
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The great body of saline water that covers 70.78% of Earth's surface.
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world ocean
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A massive sphere of incandescent gases powered by the conversion of hydrogen to helium and other heavier elements.
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star
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A general explanation of a characteristic of nature consistently supported by observation or experiment.
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theory
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