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16 Cards in this Set
- Front
- Back
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Heliocentric Model |
A model that represents the planets revolving around the sun |
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Geocentric Model |
Earth centred model of the solar system is planets and sun revolving around earth |
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Solstice |
Either of two times in the year when the sun reaches its highest or lowest point in the sky |
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Equinox |
either of the two times a year (spring or autumn) when the sun crosses the equator and day and night are of equal length. Usually occurs around March 21 and September 23 |
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Ellipse |
An oval formed around two foci; the orbital paths of planets travelling around the Sun |
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Light year |
The distance that travels in 1 year (about 9.5 trillion km) ;used to measure distances between stars and galaxies. |
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Astronomical Unit |
A measure of distance used to describe the position of planets relative to the Sun; 1 AU is equal to the average distance from the center of earth to the center of the Sun (149 599 000 km). |
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Why is telescope important |
It revolutionized astronomy with each improvement the distance between objects in space is more obvious |
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What are the 3 galaxies |
Spiral Galaxy Elliptical galaxy Irregular galaxy |
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Nebulae |
Vast clouds of gas (mostly hydrogen) and dust in space where stars are formed |
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Constellation |
Grouping of stars that form patterns in the night sky. There are 88 constellation officially |
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Interstellar Matter |
The gases and dust that exist in space between stars. Some of it comes from exploding stars |
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Terrestrial planets |
Inner planets that are earth like tend to be smaller and rockier in composition and are closer to the sun /// e.g earth, mercury, venus |
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Jovian planets |
Outer planets that are large gaseous and further from the sun e.g Jupiter saturn |
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Altitude |
The height of a celestial body above the horizon ranging from 0 ant sea level to 90° straight up |
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Azimuth |
The angle between the mostly northerly point of the horizon and the point directly below a celestial body; also the horizontal angle or direction of a compass bearing |
