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!

Jupiter guide

Jupiter Facts: The Biggest Planet in the Solar System

~10 min

The bright Jupiter is known for its many moons, unstable surface, and mysterious Great Red Spot. Is there something else? Find out!

Astronomical News
Moon-Mars Conjunction February 2023

February 2023: What Planet is Next to the Moon?

~10 min

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!

Astronomical News
Facts About Uranus

Planet Uranus: The Coldest Planet

~8 min

Uranus has a peculiar chemical composition, extreme temperatures, and the most unusual axial tilt. Here we’ll take a closer look at this planet.

Astronomical News
Mars in retrograde

What is a retrograde in astronomy? Retrograde meaning in simple words

~3 min

Figure out how retrograde motion works and learn if you should dread Mercury retrograde.

Astronomical News
Facts About Saturn

Fun Planet Saturn Facts: Explore Saturn's Rings, Moons, and More

~10 min

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.

Astronomical News
Mars and its two moons, Phobos and Deimos

Mars: Facts About the Red Planet

~9 min

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.

Astronomical News
Neptune at opposition 2021

Planet Neptune: Explore the Farthest Planet From the Sun!

~8 min

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.

Astronomical News
Amazing Planet Venus

Discover the Amazing Planet Venus

~6 min

Venus is the second planet from the Sun and the brightest planet in our sky. Learn more facts about Venus and the best time to see it in the sky.

Astronomical News
Facts About Mercury

Facts About Mercury: All You Need to Know

~7 min

Explore the closest planet to the Sun! Find out how long a day on Mercury is and how many moons the planet has. Also, keep up with the upcoming Mercury events!

Astronomical News
Venus-Saturn Conjunction in January 2023

Planets in Conjunction 2023: Venus Near Saturn, Neptune, Jupiter

~2 min

Planets meet in the sky relatively infrequently. Check our planetary conjunctions list so as not to miss them!

Astronomical News