Buying Guides
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Best Telescopes Under $100
The cheap scopes that are worth buying, and the ones to skip.
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Best Eyepieces for Dobsonians
Eyepieces matched to the fast focal ratios of Dobsonian telescopes.
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Best Budget Telescope Eyepieces
Affordable eyepieces that beat the ones bundled with 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, volcanoes and landing sites.
Latest
On July 20, 1976, a three-legged robot with a robotic arm and a set of miniature chemistry ovens touched down…
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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…
TL;DR A short-period comet is any comet whose orbit around the Sun takes less than 200 years. That’s the whole…
South Carolina has sent exactly three people to space: Charles Duke Jr., who walked on the Moon during Apollo 16;…
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