An instrument that gathers electromagnetic radiation from objects in space and concentrates it for better observation

The point where the rays of light that pass through a lens or that reflect from a mirror converge

One lens which collects light and forms an image at the back of the telescope

Why do astronomers put telescopes in space?

How does the atmosphere affect astronomical observations?

An optical telescope is an instrument that

What is the electromagnetic spectrum made of?

Humans can see radiation from

The simplest optical telescope contains

What is one advantage of reflecting telescopes?

uses mirrors to gather and focus light

all of the frequencies or wavelengths of electromagnetic radiation

uses lenses to gather and focus light

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