Good question! We can’t see all of the stars in other solar systems, but we can see some of them. When you look into the sky at night and see thousands and thousands of stars, those are the stars at the center of other solar systems. Some stars we cannot see because the visible light that they let off is not intense or bright enough to reach us on Earth. There are some stars that you can’t see with your eyes that we can see with special types of telescopes because they measure types of light that humans can’t see with their eyes.

There are billions and billions of solar systems in the universe. Some are so far away that it would take billions of years to travel to them if you were moving at the speed of light (that’s really fast). The closest solar system to ours is called Proxima Centauri; it is 4.22 light years away

That means that is would take 4.22 years to get there if you were traveling at the speed of light. If you walked around the Earth 1 billion times, that is roughly how far you would have to travel to get to the nearest solar system!

We can, and we do - but it's difficult, because other stars are light years away. A light year is a huge, huge distance; the distance from here to edge of our solar system is only two light years away!