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16 Cards in this Set
- Front
- Back
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Astronomy |
The study of the universe |
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Galaxy |
A large collection of stars dust and gas is bound together by gravity |
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Electromagnetic spectrum |
The wavelength of electromagnetic radiation such as light waves radio waves and x-rays |
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Telescope |
An instrument that collects electromagnetic radiation from the sky and concentrates it for better observation |
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Refracting telescopes |
A telescope that uses a set of lenses to gather and focus light from distant objects |
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Reflecting telescope |
A telescope that uses curved mirrors to gather and focus light from distant objects |
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Rotation |
The spinning of Earth on its axis |
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Rebelution |
The motion of a body that travels around another body in space |
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Perihelion |
The point in the orbit of a planet at which the planet is closest to the Sun |
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Aphelion |
The point in the orbit of a planet at which the planet is farthest from the Sun |
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Equinox |
The movement when the Sun appears to cross the celestial equator |
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Solstice |
The seasons of summer and winter begin on days called |
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Solar nebula |
Rotating cloud of dust and gas from which the Sun and planets formed |
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Solar system |
Consisting of the Sun the planets and all of other bodies that revolve around the sun |
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Planets |
Are the primary bodies that orbit the Sun |
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Planetesimals |
Small bodies from which a planet or originated in the early stages of formation |
