Buying Guides
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Best Telescopes for 10-Year-Olds
Easy, sturdy scopes for kids ten to fourteen who are ready for the real thing.
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Best Telescopes Under $200
Where budget scopes start showing planets and bright galaxies well.
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Best Telescopes for Adults
Serious scopes for grown-up stargazers, from first purchase to upgrade.
Free Resources
Space Printables
Free PDF quizzes and worksheets for kindergarten to adult, with answer keys.
3D Space Models
Spin real maps of the Moon and planets built from NASA data. Find craters, landing sites, the rings of Saturn, Uranus and Neptune and the moons of Jupiter.
Latest
33 Christmas gifts for kids who love space, from MAGNA-TILES and Stomp Rockets for preschoolers to first telescopes, model rockets and LEGO Technic for older kids, plus what to look at on Christmas night.
Enter a redshift and get every cosmological distance, the lookback time and the age of the universe when the light left. Works in reverse and with any Hubble constant.
32 astrophysics books for non-scientists, sorted by what you are curious about, with a math label on every pick, a 3-step reading ladder and audiobook notes.
27 astronomy books for self study sorted into six stages, from no-math popular science to university astrophysics, with the math each book expects and free courses to pair with them.
Stars form when a cold cloud of gas and dust collapses under its own weight. Dense knots heat up, ignite,…
Table of Contents Quick answer The closest NASA mission to the Sun is Parker Solar Probe. It crossed into the…
The Mayan zodiac isn’t a wheel of twelve months. It’s the Tzolk’in, a 260-day calendar where your sign is set…
Arizona has some of the darkest skies in the lower 48, and almost nobody builds a planetarium trip around that.…
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