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# Study of Space by the Electromagnetic Spectrum

## Scientists use the electromagnetic spectrum to learn about objects in space.

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Study of Space by the Electromagnetic Spectrum

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In some forms of science, physically handling study materials is impossible. This applies to the study of space. While they cannot touch space, scientists rely on electromagnetic waves to conduct their research.

Note: For help with the questions in this guide, look here.

### Speed of Light

The speed of light is 3.00 x 108 m/s

Think About It: Do you know anything faster than the speed of light?

### Light-years

A light-year is, despite its name, a unit of distance, and not time. It is simply the distance light travels in one year, which is 5.9 trillion miles.

### Back in Time

If you looked at Earth from a planet 65 million light-years away, infer what you would see on Earth’s surface.

If you viewed Earth from 5 billion light years away, what would you see? Assume Earth to be 4.6 billion years old.

Light is a form of electromagnetic radiation. This means that the vibrations from electric and magnetic fields create waves.

Electromagnetic waves all travel at the same speed, the speed of light, but differ in wavelengths and frequencies.

wavelength is the horizontal distance between two of the same points on a wave.

frequency is a measure of how many wavelengths of a wave pass through a certain point every second.

### The Electromagnetic Spectrum

The colors of light exist within the spectrum of visible light which ranges from 400 nm to 700 nm.

What are some other forms of electromagnetic waves?