New observations with the Atacama Cosmology Telescope in Chile reveal the earliest-ever "baby pictures" of our universe, showing some of the oldest light we can possibly see.

Everything we can see is because of how our eyes detect the light around us. Title: Light Light is a form of energy. When we say light, we mean the energy that we can detect with our eyes.

Watch this video which explains how light travels into our eyes so that we can see things. Of course, you can only see something when there's light. And what is light? It's energy that zooms ...

We see a planet like Jupiter because its ... of years or more to reach us from distant parts of our galaxy, which is roughly 100,000 light years wide. Once we move outside the galaxy, we encounter ...