Planets & Moons
There are 8 officially recognized Solar System planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Most of them, except Mercury and Venus, have their own natural satellites, commonly called “moons.” Some of the dwarf planets, like Pluto and Eris, have moons, too. Here, you’ll learn the best dates to observe planets in the sky and find everything you need to know about planets, dwarf planets, and natural satellites. When you learn enough, test your astronomy skills with our challenging quizzes!
April 2026 Planetary Alignment: When and Where to See Mercury, Mars, Saturn, and Neptune
Astronomy guide to the April 2026 planet parade. Learn the best dates, where the alignment is visible, and what you can really see from your location.
Venus Facts: Explore the Brightest Planet in The Sky
Meet Venus, the Earth’s “evil sister!” Get to know the planet and learn about upcoming Venus events in this article.
Bright “Star” Next to Moon: What Planet Is Near the Moon Tonight?
What is that bright dot shining near the Moon tonight? Find out about stars and planets that can be seen next to our natural satellite this month!
Explore the Red Planet: All the Must-Know Facts About Mars
Why is Mars red? What’s the gravity on Mars? Read this article to get answers to these and many other questions and learn more about the Red Planet.
Conjunction of Planets 2026: When to See Planets Close Together in the Sky
Looking for the next planetary conjunction? Here are the key dates in 2026 when planets will appear close together in the sky, plus visibility details and tips on what to watch for.
What Is a Planet Parade? Planetary Alignment Explained
Planetary alignment (aka a “planet parade” or “planet line-up”) is when several planets appear in the same part of the sky along the ecliptic. Learn what it really means and see upcoming alignment dates for 2026–2027.
Fun Facts About Mercury: What Mercury Is Like and Its One-of-a-Kind Characteristics
All you need to know about Mercury: fun facts, color and size, temperature swings, day length, and practical tips to spot it in 2026.
Jupiter Facts for Skywatchers: What Does Jupiter Look Like From Space and From Earth?
Get a clear picture of Jupiter: how it looks to the naked eye and with optics, when to see it in the sky in 2026, what it’s composed of, and what makes this gas giant special.
Planet Uranus: The Coldest Planet
What is Uranus? Learn facts about its size, rings, moons, rotation, and cold atmosphere. Also, explore Uranus’ upcoming events!
Galilean Moons: A Complete Guide to the Four Largest Moons of Jupiter
What’s the story behind discovering Jupiter’s moons? You won’t make the same mistake Galileo did while observing them if you read this article. 🔭