How do we know what we know?
Astronomers have to rely on light from distant objects in the cosmos, since we cannot visit these objects in our lifetimes. Use the links below to learn about light and the ways that astronomers use light to learn about our Universe.
Astronomers need to collect light from across the electromagnetic spectrum to completely understand a celestial object. Use the links below to explore how astronomers use the highest energies of light to learn about our Universe.
To capture the highests energy light X-rays and gamma rays astronomers must use telescopes and detectors specifically designed for the task. Use the links below to find out more about the technology astronomers use to study these wavelengths.