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34 Cards in this Set
- Front
- Back
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Absolute magnitude |
- a measure of how bright a star would appear if it were 10 parsecs from earth. |
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Apparent magnitude |
- a measure of how bright a star would be as it appears to an observer on earth. |
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Black dwarf |
- cold dark remains of a white dwarf. |
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Density |
- mass per unit volume. |
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Electromagnetic spectrum |
- different types of electromagnetic radiation ranging from radio waves to gamma rays. |
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Gamma rays |
- very high energy electromagnetic rays. |
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Gravity |
- the force that causes all matter to collect together. |
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Light year |
- The distance light travels in a year. |
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Magnitude |
- a measure of the brightness of a star. |
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Main sequence |
- a group of stars sitting on a line that run's from the top left to the bottom right of the H-R diagram. |
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Neutrio |
- a natural particle released during nuclear reactions. |
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Nuclear fustion |
- a process in which hydrogen is converted into helium to produce light and heat. |
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parallax |
- a technique used to measure the distance from stars. |
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parsec |
- A unit of length equal to 3.26 light years. |
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Plasma |
- a stare of matter consisting of positively charged ions and electrons. |
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planetary nebula |
- a cloud of gas produced when a red giant runs out of fuel. |
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Red giant |
- A star produced when the core of a star the size of a sun runs out of hydrogen. |
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Spectral class |
- A grouping system for stars based on their colour. |
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spectometer |
- A devise that splits light into a spectrum to show its component wavelengths. |
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Steller parallax |
- The change in position of a star throughout the year due to earth's movement around the sun. |
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Supernova |
- A giant explosion that occurs when a star many times the size of the sun runs out of nuclear fuel. |
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White dwarf |
- A hot, dense star that is the remains of a red giant. |
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Big Bang Theory |
- The theory that the universe began with an enormous explosion of energy. |
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Blue shift |
- The restriction of light waves due to the motion of stars towards the earth. Blue shift makes light appear bluer than it should. |
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Cosmic Background Radiation |
- The after glow of the big bang. Has low energy radiation that fills the universe. |
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Cosmology |
- The study of the history and structure of the entire universe. |
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Doppler effect |
- The expansion or compression of waves due to the movement of the object making the waves. |
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Milky way |
- The galaxy in which the solar system is located. |
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Red shift |
- The stretching of light waves due to the movement of stars away from earth. Red shift makes light appear more red than it should. |
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Steady State Theory |
- The theory that the universe has always existed in the form that it is in today. |
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Nebula |
- A cloud of gas and dust. |
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Constellation |
- A group of stars forming a pattern. |
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Solar System |
- A group of planets |
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Galaxy |
- A group of stars. |
