Buying Guides
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Best Budget Telescope Eyepieces
Affordable eyepieces that beat the ones bundled with your scope.
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Best Travel Telescopes
Backpack, carry-on and smart scopes compared by weight and what they show.
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Best Zoom Eyepieces
One eyepiece that covers several magnifications without swapping.
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.
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The best smart telescopes you can buy on Amazon right now, from the pocket-size Dwarf mini to the Celestron Origin: who each one suits, what it can and cannot photograph, and which accessories are worth adding.
Germany gave astronomy its planetary laws, its first measured star distance, the sighting of Neptune and the first picture of…
On August 15, 1977, a radio telescope in Ohio recorded 72 seconds of a narrow, powerful signal near the hydrogen…
Around 105 women have flown to space. Out of everyone who has ever left the planet, that’s fewer than 15%.…
Gravitational lensing happens when matter sits between a distant light source and you, and its gravity bends the light on…
Contents TLDR: which planetarium should you visit? Arkansas has few planetariums, and fewer of them take walk-ins. Here is the…
TLDR Table of contents Canada has a small astronomy community and a long list of results that people outside Canada…
Contents What is a binary star? A binary star is a pair of stars held together by gravity, each orbiting…
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