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 Telescopes Under $100
The cheap scopes that are worth buying, and the ones to skip.
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Best Binoviewers
Look through your telescope with both eyes for sharper, more relaxed views.
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
An interactive 3D model of three real comets: Halley, 67P and Tempel 1. Show the coma and tails, add mission sites, watch them spin and compare each nucleus with the Empire State Building.
An interactive 3D model of three real asteroids: Bennu, Apophis and Vesta. Add mission sites, watch them spin and compare each with the Empire State Building or Arizona.
A constellation identification game drawn from real star catalogue data. Three levels, 10 questions a round, from Orion and the Big Dipper to all 88 constellations.
Your weight, age, next birthday and jump height on every planet, the Moon, Pluto and the Sun, with the formulas worked out.
When is the next solar and lunar eclipse, and can you see it from where you live? Live countdown, local times, path maps and the full eclipse calendar.
Updated October 2026 by Elena Stone See whether a meteor shower is active tonight where you live, how many meteors…
The November 2026 full moon peaks on Tuesday, November 24 at 14:53 UT. Times by US zone, best nights, the name’s origin and supermoon distance.
Every full moon in 2027 with exact times in Eastern and Pacific, traditional names, supermoon and eclipse notes and all 13 new moons.
New content!
There is a new one every day.
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