STEM Challenges

The solar system, nearby stars, and distant galaxies require completely different measuring sticks. Discover the astronomical unit, the light-year, an...

Every time you look at the night sky, you are looking into the past. Light takes time to travel across space, and the most distant galaxies we can see...

Visible light is only a tiny slice of all the radiation in the universe. Explore the full electromagnetic spectrum and discover how telescopes that se...

Despite the advantages of space, the world's best ground-based observatories are scientific powerhouses in their own right. Explore the giant telescop...

The James Webb Space Telescope is the most powerful observatory ever built and launched. Learn how this extraordinary machine works, where it is, and ...

Putting telescopes in space changed astronomy forever. Discover the famous observatories that look at the universe in visible light, X-rays, infrared,...