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14 terms

Astronomy Vocabulary Set #1

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astronomy
the study of the universe
day
time for Earth to make a complete rotation on its axis
eclipse
an event in which the shadow of one celestial body falls on another
electromagnetic spectrum
all of the frequencies or wavelengths of electromagnetic radiation; all of the forms of energy released from the sun
month
a division of the year that is based on the orbit of the moon around the earth
orbit
the path that a body follows as it travels around another body in space
phase
the change in the sunlit or illuminated area of one celestial body as seen from another celestial body
reflecting telescope
a telescope that uses a curved mirror to gather and focus light from distant objects
refracting telescope
a telescope that uses a set of lenses to gather and focus light from distant objects
revolution
the motion of a body that travels around another body in space; one complete trip along an orbit
rotation
the spin of a body on its axis
satellite
a natural or artificial body that revolves around a planet
telescope
an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
year
the time required for Earth to revolve once around the sun