Buying Guides
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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 Space Books for Kids
28 picks sorted by age, from board books for toddlers to Apollo history for teens.
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Best Telescopes for Galaxies
Big-aperture scopes for galaxies, nebulae and other deep-sky objects.
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
Finding a telescope that is reliable, affordable, and light can be a challenge. There are too many options in this…
Every night we can see the Moon in the sky over our planet. Since ancient times, people like you and…
Jupiter is the biggest planet in the Solar system and is located more than 872 million kilometers (542 million miles)…
Comets are some of the most spectacular objects to look at in the Solar system. They are basically giant snowballs…
The best telescope eyepiece set for most people is the Celestron 1.25-inch kit (94303): five Plossl eyepieces from 32 mm…
Asteroids are very interesting astronomical objects. There are billions of them just in the Solar system and each of them…
Comparing Mercury and Jupiter is a very interesting exercise because, at first glance, they are complete opposites. Mercury is the…
Uranus is one of the eight planets in the Solar system. It is second-to-last in order of distance from the…
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