Buying Guides
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Best Books About Mars
The best reads on the Red Planet, for kids and adults.
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Best Telescopes for Teenagers
Real telescopes a teen can set up alone and keep using for years.
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Best Celestron Eyepieces
Celestron's eyepiece lines compared, so you can pick the right one for your scope.
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
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.…
All 88 constellations with a star chart drawn from real star positions, the meaning of each name, pronunciation, best month to see it and free printable PDFs.
Find every Great Red Spot transit in your local time, see which ones are observable from your location and where the spot is on Jupiter right now.
Calculate your telescope’s resolving power, watch two stars split in a live diffraction simulator and see which double stars, lunar craters and planet details your telescope can show.
26 Christmas gift ideas for astronomy lovers, sorted by where they are in the hobby: no telescope yet, telescope owners, readers, space fans at home and stocking stuffers.
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