STEM Challenges
Explore fun and educational challenges across math, science, engineering, and coding!
Showing 6 of 209 challenges
Binary and Multiple Star Systems
Space ExplorerMore than half of all star systems in our galaxy contain two or more stars. Binary and multiple star systems are not just fascinating to observe — the...
Spectral Classification
Space ExplorerEvery star leaves a fingerprint in its light. By spreading starlight into a spectrum, astronomers can read a star's temperature, composition, motion, ...
The Hertzsprung-Russell Diagram
Space ExplorerIn 1910, two astronomers independently discovered that stars are not randomly scattered by temperature and brightness — they fall into distinct groups...
Color, Temperature, and Luminosity
Space ExplorerA star's color is not just decorative — it directly reveals its surface temperature. And a star's brightness depends on both how hot it is and how big...
What Is a Star?
Space ExplorerStars are not just bright dots in the sky — they are massive spheres of plasma held together by gravity and powered by nuclear fusion. Discover what d...
The Sun's Future
Space ExplorerOur Sun is about halfway through its life. Over the next 5 billion years it will transform dramatically — expanding into a red giant, shedding its out...