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 Star Diagonals
Mirror or prism, 1.25 or 2 inch: the right diagonal for your scope.
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Best Refractor Telescopes for Beginners
Low-maintenance scopes that are ready to use the night they arrive.
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
TLDR Table of Contents What makes a star’s planets habitable? A planet counts as potentially habitable when it orbits inside…
Utah has one full-scale public planetarium, one tiny campus dome that hosts free evening shows, and one mobile dome that…
Denmark has one astronaut who has flown: Andreas Mogensen. He was the first Dane in space in 2015, and in…
Most articles about Chinese astronomy are really articles about instruments, dynasties, and star catalogues — the field, not the people…
TLDR “Stars named after animals” is really three different questions people mash together. Individual stars have animal nicknames (Sirius is…
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…
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