Dark Clues to the Universe

With 200 billion stars in our own galaxy, you might expect the night sky to be lit up like daylight. If you live in a big city, it just might be—but not because of starlight. But just why is it so dark at night? It took astronomers a very long time to figure it out.

Hubble image of Galaxy NGC 4414
Credit: NASA and The Hubble Heritage Team (STScI/AURA)

Read all about it here…