Buying Guides
-
Best Eyepieces for Each Planet
The focal length to use for Mercury through Neptune, planet by planet.
-
Best Refractor Telescopes for Beginners
Low-maintenance scopes that are ready to use the night they arrive.
-
Best 50mm Telescopes
Small, light starter scopes for the Moon and the brightest planets.
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 West Virginia has fewer planetariums than you’d expect from a state with some of the darkest…
The Mars Exploration Rover mission sent two identical rovers, Spirit and Opportunity, to opposite sides of Mars in January 2004.…
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…
New content!
There is a new one every day.
-
Recently updated
-
