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Stars, Galaxies, & the Univers
Chapter 4 section 1 Vocabulary
11
Astronomy
7th Grade
01/11/2009

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Term
Telescope
Definition
A device built to observe distant objects by making them appear closer.
Term
Electromagnetic Radiation
Definition
Energy that travels through space in the form of waves.
Term
Visible light
Definition
Electromagnetic radiation that can be seen with the unaided eye.
Term
Wavelength
Definition
The distance between the crest of one wave and the crest of the next wave.
Term
spectrum
Definition
The range of wavelengths of electromagnetic waves.
Term
Optical telescope
Definition
A telescope that uses lenses or mirrors to collect and focus visible light.
Term
Refracting telescope
Definition
A telescope that uses convex lenses to gather and focus light.
Term

reflecting telescope

Definition
A telescope that uses a curved mirror to collect and focus light.
Term
Convex lens
Definition
A piece of transparent glass curved so that the middle is thicker than the edges.
Term
Radio telescope
Definition
A device used to detect radio waves from objects in space.
Term
Observatory
Definition
A building that contains one or more telescopes.
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