Buying Guides
-
Best Star Projectors
Put the night sky on the bedroom ceiling. Projectors for kids and adults.
-
Best Telescopes for Adults
Serious scopes for grown-up stargazers, from first purchase to upgrade.
-
Space Coffee Table Books
Six big, beautiful space books to leave out for guests.
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
Find every Great Red Spot transit in your local time, see which ones are observable from your location and where the spot is on Jupiter right now.
Calculate your telescope’s resolving power, watch two stars split in a live diffraction simulator and see which double stars, lunar craters and planet details your telescope can show.
26 Christmas gift ideas for astronomy lovers, sorted by where they are in the hobby: no telescope yet, telescope owners, readers, space fans at home and stocking stuffers.
Frank Zappa named his daughter Moon Unit in 1967, and she has spent decades explaining it. The good news for…
Most galaxy name lists mix in boys, dogs and fictional characters, then get half the meanings wrong. One popular roundup…
TLDR Sixteen astronauts flew NASA’s Project Gemini. There were ten crewed missions, Gemini 3 through Gemini 12, flown between March…
Table of Contents Biosignatures vs technosignatures The question “what are the signs of alien life?” has two different answers, and…
For most of history, astronomy meant collecting light. Since 2015, it also means feeling the universe shake. Gravitational waves are…
New content!
There is a new one every day.
-
Recently updated
-
