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Definition
the average distance between Earth and the stars.
(AU)
1.5x1011 |
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Definition
the distance light travels in a year.
1013 |
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Definition
| a great cloud of stars, gas, and dust bound together by the combined gravity of all the matter. |
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Definition
a scale to measure the brightness of stars developed by Ptolemy in AD 140.
Orginally by Hipparchus 190-120 BC |
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Definition
| how a star looks by naked eye from earth |
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Definition
| the tilt of the Earth as it wobbles on its axis around the Sun. caused by the gravity of the Sun and moon |
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| a large imaginary sphere surrounding the Earth where the Sun, Moon, and stars seem to be attached |
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Definition
| the top of the sky above your head |
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Definition
| the sky directly below your feet |
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Definition
| turning of a body on its axis |
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Definition
| movement of a body around another body |
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| the apparent path of the sun against the stars |
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Definition
| when the moon passes through the Earth's shadow and sunlight is cut off |
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| the region of a shadow that is totally shaded. |
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Definition
| when the moon lines up with the sun and blocks it |
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Definition
| the moons closest to the earth |
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Definition
| moon farthest from the earth |
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Definition
| the points where the moon passes through the earths orgit. |
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Definition
| small changes in the earths orbit, the precession, and the inclination can produce ice ages |
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Definition
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| measure of the amount of matter in an object. Weight is the effect of gravity |
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Definition
| distance between peaks in a wave |
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Definition
| a particle of electromagnetic radiation |
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Definition
| gamma ray, xray, ultraviolet, visual, infrared, microwave, radio waves |
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Definition
| on a telescope, the distance between the lens and the image formed of a distant light source |
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Definition
| using information from multiple telescopes as if it were one |
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| a microchip that acts like a photo plate to record informaiton then put into a computer as a series of numbers. |
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Definition
| spread the light into a spectrum |
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Definition
| can detect hydogen clouds where stars may form. on the ground |
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Definition
| hubble from space mars and polar cap |
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Definition
| Compton Gamma ray observatory black holes |
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| atoms interact with light to produce dark or light lines that cross the spectra at specific positions |
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| spectra contain information about the chemical composition of the star and its motion relative to the Earth |
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Definition
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Definition
| made of protons, neutrons, and electrons. mostly empty space. |
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| atoms that have the same # of protons, but a different # of neutrons |
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| when an atom loses an electron |
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| the energy that holds the electron to the atom |
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Term
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Definition
| On this scale, 0 degrees is the temperature at which an object comtains no thermal energy. |
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Definition
| both hot and cold stars have weak lines, medium temp stars have strong. |
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Definition
| bright gases above the photosphere |
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Definition
| bright visible surface of the sun |
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Definition
| hot fluid rises and cold fluid sinks |
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Definition
| looped magnetic fields extending up through the photosphere on the sun |
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Definition
| magnetic fields that extend out from the sun that reach earth |
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Definition
| using the vibrations in the sun to explore its depth |
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