Question: How many stars are there in space?

Tim Duckenfield answered on 6 Mar 2018:

We think there are billions and billions of stars, but we might never see them all! The problem is that the Universe is ‘only’ 13.8 billion years old. So stars who are so far away their light would take that long to reach us, well we can’t see them yet!

Of the ones we can see right now, well our galaxy (the Milky Way) has around 300 billion stars in. And we think there are around 100 billion galaxies apart from our own! If we multiply these together, and take into account the different size of galaxies, we think maybe about 70 billion trillion stars are in our visible universe. A lot a lot a lot!