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Astronomy Vocab

Chapter 1

Astronomy the study of the universe
Year the time required for the Earth to orbit once around the sun
Month a division of the year that is based on the orbit of the moon around the Earth
Day the time required for the Earth to rotate once on its axis
Telescope an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
Refracting telescope A telescope that uses a set of lenses to gather and focus light from distant objects
Reflecting A telescope that uses a curved mirror to gather and focus light from distant objects
Electromagnetic spectrum all of the frequencies or wavelengths of electromagnetic radiation
Constellation a region of the sky that contains a recognizable star pattern and that is used to describe the location of objects in space
Horizon the line where the sky and the Earth appear to meet
Zenith the point in the sky directly above the observer
Light-year the distance that light travels in one year; about 9.46 trillion kilometers
Altitude the angle between an object in the sky and the horizon
Created by: Mary806