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 Telescopes Under $500
More aperture and steadier mounts in the serious-upgrade price range.
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Best Barlow Lenses
Double or triple every eyepiece you own. 2x, 3x and 5x picks compared.
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
Upcoming rocket launches from Cape Canaveral and Kennedy Space Center, with countdowns and viewing spots.
Upcoming rocket launches worldwide with live countdowns, local times and official webcasts.
The closest star to Earth is the Sun, 8.3 light-minutes away. The closest star after that is Proxima Centauri, a…
The Sun affects Earth in two ways. Its steady light and heat drive photosynthesis, weather, ocean currents, day and night,…
Montana has two planetariums that open to the public on a regular schedule: the Taylor Planetarium in Bozeman and the…
Iowa has eight observatories where an ordinary person can walk up and look through a real telescope. Some are free…
The Ptolemaic constellations are the 48 star patterns catalogued by the astronomer Claudius Ptolemy in the Almagest, around 150 CE.…
Answer 10 quick questions to find out which moon matches your personality. There are 12 possible results, each with real moon facts.
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