Light and the Spectrum

Each color on the electromagnetic spectrum has a different wavelength.

Light from stars near and far travels through space and time to reach the Earth. This light is the basis of modern astronomy. It allows astronomers to understand the distances of stars, as well as their temperatures. Believe it or not, not all stars are white, and not all light is visible. Light is an important focus of study for astronomers.

Essential Questions

• What is the electromagnetic spectrum?
• What is the visible spectrum?