Thousands of years ago, people learned about the
universe by looking at the night sky. They could only see a few nearby planets and a few thousand stars.
Then, telescopes were invented, and we could see much farther into the universe and find much fainter objects.
Today, we put telescopes in space, and we can see even more - we can even find planets in other solar systems.
As technology improves, we can see more and
more places in the universe that we can never travel to.