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18 Cards in this Set
- Front
- Back
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ASTRONOMY
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Study of the stars.
astro - meaning stars onomy - study of |
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COSMOLOGY
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Study of the universe.
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GALAXY
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a system of millions or billions of stars, together with interstellar medium of gas and dust, and dark matter, held together by gravitational attraction.
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DOPPLER EFFECT
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increase or decrease in the frequency of sound, light or other waves as the source and observer move towards or away from each other
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STEADY STATE THEORY
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Theory that the galaxies are evenly spaced and the universe mantains a constant density.
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BIG BANG THEORY
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Theory that the universe originated from a cataclysmic explosion 14 billion years ago.
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APPARENT MAGNITUDE
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Measure of how bright a star will appear to observers on earth.
Brighter star have a low magnitude. Dimmer stars have higher magnitude. |
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ABSOLUTE MAGNITUDE
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Measure of how bright a star would appear if it was 10 parsecs away from earth.
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DARK MATTER
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Non - luminous material which exists in space.
Can exist in two forms: - Cold dark matter (weakly interacting) - Hot dark matter (high-energy random created soon after Big bang. |
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LIGHT YEAR
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Used to measure interstellar distances.
The distance that light will travel in a year. Approximately 9.5 trillion kilometres. |
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PARSEC
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Another unit of measurement Astronomers use.
1 parsec (pc.) is equivalent to 3.26 light years. |
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COSMIC MICROWAVE BACKGROUND RADIATION
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The 'afterglow' left by the Big Bang.
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HUBBLE'S LAW
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A law stating that the red shifts in the spectra of distant galaxies and their speeds of recession are proportional to their distance.
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CARBON CYCLE
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RED SHIFT & BLUE SHIFT
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The displacement of spectral lines towards longer wavelengths, the red end of the spectrum in radiation from galaxies and celestial objects
Blue shift is opposite. |
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LARGE HADRON COLLIDER
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The highest energy particle collider ever made
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HERTZSPRUNG - RUSSELL DIAGRAM
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Scatter graph of stars showing relationship between luminosity and spectral types or temperatures
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PLANETS
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Mars, Venus, Earth, Mercury, Jupiter, Saturn, Uranus, Neptune
My Very Energetic Mother Just Served Us Nachos |
