science vocab pt2 – Flashcards
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big bang theory
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suggests the universe started w/an explosion (BANG!) and an expansion of a hot, dense, compact fireball
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cosmological principal
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universe looks the same @ any location, but can change overtime
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cosmologist
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scientist who study the origin and structure of the universe
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cosmology
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study of the origin and structure of the universe
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galaxy
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large scale collection of stars, dust and gas held together by gravity
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general relativity theory
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Albert Einsteins theory that space and time are relative to matter
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inflation theory
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theory that upholds the big bang theory, but suggests there was a very rapid and unimaginable expansion
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isotropic
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identical in all directions
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oscillating universe theory
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theory that suggests the universe is a never ending cycle of expansion and contraction
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perfect cosmological principal
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steady state belief that the universe looks the same in the past, present, and future and does not change over time
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quasars
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oldest and farthest celestial bodies of the universe
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steady state theory
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theory that suggests the universe has been and will continue to be as it is now
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makes assumptions
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How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it
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perfect cosmological
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Mr. Biggins believes that the universe has been and always will look and be structured the same throughout all time. He supports the ______ principle.
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cosmologists
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Scientists who study the origin and structure of the universe are known as _____.
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universe exploded into existence
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Lemaitre (based on Hubble's observations) was the first to suggest the _____.
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false
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Big bang theorists believe that the universe is expanding and will eventually contract.
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a fireball
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The big bang theory suggests that the origin of the universe began with ______ that exploded and expanded
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very hot
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According to the big bang theory, the universe was once a very ______ and hostile place
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true
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According to the big bang theory, galaxies formed a billion years after the "bang" from matter that clumped together due to gravitational forces
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300,000 years
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According to the big bang theory, after the "bang," the universe remained dark until about ______ later, when neutral atoms began to form
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13 billion years ago
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According to the big bang theory, how long ago did the universe begin?
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oscillating universe theory
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This theory suggests that for every big bang, there is a big crunch
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oscillating universe theory
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Mr. Tolman believes that our universe is expanding, but with all of the gravitational force from the celestial bodies of space, the universe will begin to contract. He believes in the _____
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oscillating universe theory
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The most recent theory that upholds the big bang theory, but suggests a sudden expansion after the bang, is called the _____
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inflation theory
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Which theory explains why our universe is structured and uniform and suggests that the universe is flat in shape
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perfect cosmological principal
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Mr. Bondi suggests there doesn't have to be some chaotic event, such as an explosion, to explain the origin of the universe. Our universe was and just is. It looks the same from every location and does not change. Mr. Bondi believes in the _____
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steady state theory
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This theory lost its appeal when astronomers discovered quasars and cosmic background radiation
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true
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Although there is scientific evidence and many scientific theories about the origin of the universe, how it all happened remains a question
