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!
Neptune: Farthest Planet From Earth
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.
Proof the Earth Is Round: Debunking Flat Earth Theory
What is the real shape of the Earth? It turns out, the answer is not obvious for some people! Take a look at 7 ways you can prove that the Earth is round.
Venus Facts: Explore the Brightest “Star” in The Sky
In May 2025, Venus will be shining at its brightest in the morning sky! Get to know the planet and learn about upcoming Venus events in this article.
Calendar of All Astronomical Events 2025
Ready to spend 2025 staring at the sky instead of your phone? We've got all the astronomical events of the year in one place. Check out the dates and times for conjunctions, meteor showers, eclipses, supermoons, equinoxes, solstices, and more.
Planetary Conjunctions 2025: What Are These Two Bright “Stars” in the Sky?
See two planets side by side! Learn about the upcoming events in 2025, get observing tips and fascinating insights into planetary conjunctions.
Planetary Opposition 2025: Best Time to See Planets
The best time to view most planets is at the astronomical opposition. Find out what it means and when to see the upcoming oppositions.
Planet Saturn: How to Find Saturn in the Sky in 2025?
How many rings does Saturn have? Where is Saturn tonight in the sky? Find answers to these and other most common questions about Saturn in our 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!
Mars Quiz: Explore Our Future Home
Our descendants may possibly live on Mars. Explore the future home of mankind with this quiz!
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.