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 Opposition 2023

Planetary Opposition 2024: Jupiter, Saturn, and Other Planets At Their Brightest

~7 min
Astronomical News

The best time to view most planets is at the astronomical opposition. Find out what it means and when to see the upcoming oppositions.

Planets next to the Moon: June 2024

June 2024: What Planet is Next to the Moon Tonight?

~11 min
Astronomical News

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!

Facts About Mercury

Facts About Mercury: All You Need to Know

~8 min
Astronomical News

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!

Planetary Alignment in space

Planetary Alignment 2024: What Is It? When Is the Next Planetary Alignment?

~11 min
Astronomical News

Six planets will line up in the sky on August 28, 2024! Discover how to see them all and get a glimpse into the science behind planetary alignments.

Mars-Uranus in July 2024

Planetary Conjunctions: What Are They and When Is the Next One?

~3 min
Astronomical News

Stay up to date with our complete list of planetary conjunctions! Mark your calendars, and be sure to observe these fascinating astronomical phenomena.

Mars and its two moons, Phobos and Deimos

Mars: Facts About the Red Planet

~9 min
Astronomical News

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.

Neptune at opposition 2021

Planet Neptune: Explore the Farthest Planet From the Sun!

~9 min
Astronomical News

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.

Amazing Planet Venus

Facts About Venus: Explore the Earth's Sister Planet

~8 min
Astronomical News

Why is Venus so hot and bright? When is the best time to observe it? Read this article to get answers to these and many other questions about this planet.

Earth Day Quiz

Earth Quiz: Explore Our Special Planet 🌍


From the magnetic field to the ozone layer, discover what makes our home planet truly extraordinary. Let's find out why the Earth is such a special place and compare it with other Solar System planets!

Nibiru Cataclysm

Planet Nibiru Explained: What Is It, and Will It Destroy the Earth?

~6 min
Astronomical News

No one has ever seen Nibiru, and its very existence would defy the laws of physics. Still, about 50% of people think Nibiru is real. Are they right? Let's see.