STEM Challenges
Explore fun and educational challenges across math, science, engineering, and coding!
Showing 6 of 156 challenges (filtered)
The Cosmic Microwave Background
Space ExplorerTurn any radio antenna to the sky and a tiny fraction of the static you receive is something extraordinary — the oldest light in the universe, the fad...
Big Bang Nucleosynthesis — The First Atoms
Space ExplorerFor about twenty minutes, the entire universe was a nuclear reactor. In that brief window, the fates of all hydrogen and helium in the cosmos were sea...
The First Moments — Inflation and Particle Creation
Space ExplorerIn the first trillionth of a trillionth of a trillionth of a second, the universe underwent changes more dramatic than anything since. An era of explo...
What Was the Big Bang?
Space ExplorerThe Big Bang is the most tested and best-supported theory of the origin of the universe — but it is also one of the most misunderstood. What do scient...
What Expansion Really Means
Space ExplorerThe expanding universe is one of the most misunderstood concepts in all of science. There was no explosion into empty space. The universe has no cente...
Hubble's Law and the Hubble Constant
Space ExplorerIn 1929, Edwin Hubble presented one of the most remarkable graphs in the history of science: distance plotted against recession velocity, forming a st...