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