There are many things about the universe that we don't know, but scientists are learning more every day. Using observations from things like the Hubble Telescope, astrophysicists, astronomers, and other scientists use tools like physics and math to help them understand more about different aspects of what lies in outer space.

Scientists do research on everything from the life cycle of a star to the expansion of the universe. Do you want to know more about black holes? You can watch a video of a black hole devouring a star. Do you want to know if there is life elsewhere in the universe? You can read about the Kepler Project, an initiative taken by NASA to find habitable planets elsewhere in the universe by analyzing the minute wobbles in the rotation of different stars. Do you want to know why comets lead with their tails? You can learn about that, too!

If you want to know more about what lies past the boundaries of our solar system, our galaxy, and even our universe, the articles and activities in this section can help you fill in the blanks. Even better, they can help you find the things that we don't know yet that you could one day discover. After all, there's a reason we call space the Unknown!