No, that's not true! While visible light is one part of the electromagnetic spectrum, astronomers utilize a wide range of wavelengths to study space.

Here's why astronomers use more than just visible light:

* Different wavelengths reveal different things: Just like different colored lights can reveal different details in a painting, different wavelengths of light reveal different aspects of celestial objects.

* Many objects are invisible in visible light: Some objects, like nebulae and young stars, are obscured by gas and dust that blocks visible light. Infrared and radio telescopes can penetrate these clouds.

* Studying extreme environments: Very hot objects like supernovae emit mainly in the X-ray range, while cold objects like the cosmic microwave background radiate primarily in the microwave range.

Here are some examples of telescopes that use different wavelengths:

* Visible Light: Hubble Space Telescope

* Infrared: Spitzer Space Telescope, James Webb Space Telescope

* Ultraviolet: GALEX

* X-ray: Chandra X-ray Observatory

* Radio: Very Large Array (VLA)

So, astronomers are like detectives, using different tools (telescopes) and wavelengths of light to piece together a complete picture of the universe.