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29 Cards in this Set
- Front
- Back
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The field of ___________ is concerned with the composition and movement of heavenly bodies
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Astronomy
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Define Astrophysics
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is the science which attempts to explain the physical principles, laws, and mechanics behind astronomical observations and theory
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Big Band Theory
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The theory theat the universe began with an explosion
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Hubble law
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makes it possible for us to estimate the speed at which the universe is expanding, and it also allows us to estimate the apporximate age of the universe.
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It has been observed the the more _________ parts of the universe are moving faster than the __________ parts.
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distant
inner |
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Define and describe the optical telescope
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form images of celestial objects by gathering the light produced or reflected by them.
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Name the 2 types of optical telescopes.
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Refracting and Reflecting
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Radio telescopes do..........
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detect and analyze radio waves rather than visible light
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Spectographes analyze
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the light generated by stars in an effort to determine the chemical composition of these bodies.
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Infared astronomy which detects
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and measures the long infared waves from astronomical targets and thereby determines the temperature of these objects.
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Radar astronomy is
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the only non-passive tool of astronomy. radio waves are transmitted to a distant object that then reflects these waves back to earth. Used to calculate the object's distance from earth
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A ________ is a celestial body that emits light that has been generated within it by very high temperature nuclear reactions.
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Star
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White dwarf stars are near
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death
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White dwarfs become ________ _________ that no longer shine.
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black dwarfs.
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What is interstellar medium?
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Vast clouds of gas and dust, located between the stars
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What are the most massive objects in the milky way galaxy?
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Giant molecular clouds
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What is a glaxay?
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is a very large group of stars, it also contains gas, planets and interplanetary dust.
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Name the types of galaxies.
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Spiral
Elliptical Irregular |
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What type is ours?
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Spiral
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Name the parts of a Spiral galaxy.
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Never Nucleus
Cut Curved Arms Dry Disk Hair Halo |
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Define Quasars
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Are quasi-stellar objects that emit radio waves during a time period of their life.
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What is a black hole
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are celestial objects that are thought to be embedded in otherwise normal galaxies.
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Black holes form from
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the death of giant stars.
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At the center of a black hole, ________ stops, and _________ has no volume because it is so __________
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Time
Mass Dense |
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The gravitational attraction near the singularity of a black hole is so great
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that light itself cannot escape.
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Describe Dark Matter
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it is inferred from the gravitational effects it has on visible objects in the universe. 99% of the universe may be dark matter.
Dark matter is found in halos that surround the parts of spiral galaxies. |
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Describe the Great Attractor
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At the center of the universe it is why the distant parts or moving faster than the inner parts. Has been calculated to possess a mass 3 x10(16) times that of our sun. Is assumed to be composed of dark matter.
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The distance between the sun and planets are expressed in terms of __________ _________
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Astronomical Units (AU)
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Our solar system is believed to have formed about 4.6 billion years ago from a rotating hot cloud of gas and dust called a _________ ________
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solar nebula
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