What year was the telescope invented?

Who is credited for inventing the telescope?

Who invented the reflective telescope?

A reflective telescope uses

A refractive telescope uses

Optical telescopes uses which wave of the electromagnetic spectrum?

Reflective and Refractive telescopes are examples of which type of telescope?

Why are many large observatories found on mountaintops?

The Hubble, the Spitzer, and the Chandra X-ray Observatory are examples of

In order from longest wavelength to shortest wavelength, the waves of the electromagnetic spectrum are

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