Summary
Highlights
The Nature of Light00:00:07
Light is electromagnetic radiation that acts as both a wave and a particle. It is characterized by its wavelength and frequency, where shorter wavelengths correspond to higher energy and longer wavelengths correspond to lower energy.
How Humans Perceive Light00:02:04
The human eye's retina contains rods for brightness and cones for color, which are only sensitive to a very specific range of energy called visible light. Light outside this range is either too energetic to penetrate the eye or lacks sufficient energy to stimulate the retina.
Observing the Invisible Universe00:03:33
Because we can build digital detectors and specialized telescopes that function like artificial eyes, we can observe light outside the visible spectrum. This allows us to study the universe in its full spectrum, applying the physics we learn on Earth to understand distant stars and galaxies.