The Nine Planets is an encyclopedic overview with facts and information about the history, mythology and current scientific knowledge of the planets, moons and other objects in our solar system and beyond.
The 8 Planets in Our Solar System
Mercury
The smallest and fastest planet, Mercury is the closest planet to the Sun and whips around it every 88 Earth days.
Venus
Spinning in the opposite direction to most planets, Venus is the hottest planet, and one of the brightest objects in the sky.
Earth
The place we call home, Earth is the third rock from the sun and the only planet with known life on it - and lots of it too!
Mars
The red planet is dusty, cold world with a thin atmosphere and is home to four NASA robots.
Jupiter
Jupiter is a massive planet, twice the size of all other planets combined and has a centuries-old storm that is bigger than Earth.
Saturn
The most recognizable planet with a system of icy rings, Saturn is a very unique and interesting planet.
Uranus
Uranus has a very unique rotation--it spins on its side at an almost 90-degree angle, unlike other planets.
Neptune
Neptune is now the most distant planet and is a cold and dark world nearly 3 billion miles from the Sun.
The Five Dwarf Planets
Ceres
Ceres is the largest object in the asteroid belt, but was reclassified a dwarf planet in 2006 - even though it's 14 times smaller than Pluto.
Pluto
Pluto will always be the ninth planet to us! Smaller than Earth's moon, Pluto was a planet up until 2006 and has five of its own moons!
Haumea
Haumea lives in the Kuiper belt and is about the same size as Pluto. It spins very fast, which distorts its shape, making it look like a football.
Makemake
Also in the Kuiper belt, Makemake is the second brightest object in the belt, behind Pluto. Makemake (and Eris) are the reason Pluto is no longer a planet.
Eris
Eris is the same size as Pluto, but three times further from the Sun! It's so far away, we don't know much about this extremely cold and remote dwarf planet.
Other Objects in The Solar System
The Sun
The Sun is the heart of our solar system and its gravity is what keeps every planet and particle in orbit. This yellow dwarf star is just one of billions like it across the Milky Way galaxy.
The Moon
The only place beyond Earth that humans have explored, the Moon is the largest and brightest object in our sky - responsible for the tides and keeping Earth stable on its axis.
Comets
Comets are snowballs made up of frozen gas, rock, and dust that orbit the Sun. As they get closer to the Sun, they heat up and leave a trail of glowing dust and gases.
Asteroids
Asteroids are small, rocky, debris left over from the formation of our solar system around 4.6 billion years ago. There are currently over 822,000 known asteroids.
Asteroid Belt
Between the orbits of Mars and Jupiter, the asteroid belt contains an estimated 1.9 asteroids. The total mass of all objects in the asteroid belt is still less than that of Earth's Moon.
Earth Science course
Excel High School has an online high school Earth Science course. Learn more about the course details here.
Northgate Academy offers Earth science and astronomy as homeschooling courses.
TraintheBrain provides online tutoring aimed at the deep discovery of astronomy, earth science, and more subjects related to our solar system.
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