Buying Guides
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Best Eyepieces for Dobsonians
Eyepieces matched to the fast focal ratios of Dobsonian telescopes.
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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 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.
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TLDR May has quietly produced one of the densest clusters of astronaut birthdays on the calendar — Sally Ride, Scott…
TLDR Kansas has exactly three public planetariums: the Justice Planetarium inside the Cosmosphere in Hutchinson, the L. Russell Kelce Planetarium…
On July 20, 1976, a three-legged robot with a robotic arm and a set of miniature chemistry ovens touched down…
TLDR: Carbon stars are dying red giants that have belched so much soot-forming carbon into their own atmospheres that it…
Louisiana builds rockets before it produces astronauts. NASA’s Michoud Assembly Facility, a 43-acre plant in New Orleans East, is where…
Most “Hispanic astronauts” roundups repeat the same three names — Franklin Chang-Díaz, Ellen Ochoa, José Hernández — and call it…
Pick any hundred-year stretch in the history of science and none of them do more damage to old certainties than…
Arizona doesn’t just have dark skies. It has the infrastructure to do something with them — a state where an…
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