Tags: stars

How Stars Work

It’s a dark, clear, moonless night. You look up into the sky. You see thousands of stars arranged in patterns or constellations. The light from these stars has traveled great...

How Much Starlight Has Been Emitted Since the Beginning of Time?

Here’s a mind-blowing figure for you: 4,000,000,000,000,000,000,000,000,000,000,000,000,000,000, 000,000,000,000,000,000,000, 000,000,000,000,000,000,000. In case you’re wondering what all those digits signify, that’s the number of photons — more compactly expressed as 4 x...