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!
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.
Planetary Alignment on April 18, 2026: How to See Four Planets Before Sunrise
See a dawn “planet parade” on April 18, 2026: Mercury, Mars, Saturn, and Neptune appear close together before sunrise. Learn the best time and get spotting tips.
Saturn Facts: Size, Rings, Moons & How to See It Tonight
How many rings does Saturn have? Where is Saturn tonight in the sky? Find answers to these and other common questions about the ringed planet in our article.
Planet Parade Map: When Is the Next Planetary Alignment?
Planetary alignments explained with a clear infographic: a planetary alignment chart and planet parade map — plus common myths debunked.
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.
Conjunction of Planets 2026: When to See Two Planets Next to Each Other?
See two planets side by side! Discover rare planetary events in 2026. Get dates, times, and viewing tips now!
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!
What Is Retrograde Motion? Which Planets Are Retrograde Right Now (March 2026)
Learn what retrograde means, see which planets are retrograde right now, and get an easy way to observe retrograde loops.
Neptune: The Farthest & Windiest Planet in the Solar System
How big is Neptune? What is Neptune made of? Why is Neptune blue? Read our article and learn curious facts about the outermost planet in the Solar System.
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.