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The question has been debated ever since Newton. But physicists are still in the dark about whether light is 1) a wave, 2) a particle or 3) a combination of both. Sometimes it behaves like one, ...

What an excellent question, Will! I too wondered about this when I started to learn the wonders of physics. To answer this, we must first explain three things: 1) what is light, 2) what is gravity, ...

In Hubble pictures taken just months apart of V838 Monocerotis, the dust ring around this star grows by several light-years during that time, called a “light echo.” How can something grow by 5 ...