STEM Challenges
Explore fun and educational challenges across math, science, engineering, and coding!
Showing 6 of 319 challenges
Redshift — Light Stretched by Expanding Space
Space ExplorerWhen astronomers look at distant galaxies, their light has been stretched to longer, redder wavelengths by the expansion of space itself. This cosmolo...
Edwin Hubble and the Scale of the Universe
Space ExplorerA century ago, astronomers debated whether the fuzzy spiral nebulae in the sky were part of our own galaxy or immensely distant island universes. The ...
How Large-Scale Structure Formed
Space ExplorerThe cosmic web did not appear by chance — it grew over 13 billion years from quantum seeds planted during the Big Bang. Discover how the faintest ripp...
Superclusters and the Cosmic Web
Space ExplorerZoom out far enough and the universe reveals a stunning structure — a cosmic web of filaments, sheets, and vast empty voids. From our home supercluste...
Galaxy Groups and Clusters
Space ExplorerGalaxies are social creatures — they gather in groups and clusters held together by gravity. Discover the Local Group (our own galactic neighborhood),...
Seyfert Galaxies and Blazars
Space ExplorerNot all active galaxies are as dramatic as quasars. From the common, nearby Seyfert galaxies with their unusually bright nuclei, to the extreme blazar...