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Planets In Order: By Size And Distance From The Sun

Kate Broome
on
January 30, 2018
 43 Comments 🔥!

The planets in order from the sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and finally the dwarf planet Pluto.

Most people have at least heard about our solar system and the planets in it. Our solar system is usually gone over in elementary school, so you might just need a refresher course about the planets in order in our solar system. Check out this guide to learn all about the planets, their size, and their order in the solar system.

Without Jupiter cleaning out the early solar system, the Earth would be pock-marked with meteor collisions. We would suffer from asteroid impacts every day. CNN studios would probably be a gigantic crater it if wasn’t for Jupiter. – Michio Kaku

Our Solar System’s Planets in Order

Our solar system revolves around the sun, hence the name solar system. In our system, we have 4 terrestrial planets, 4 gas giants, and a mysterious 9th planet. Let’s go over them, but first, here’s a quick rundown of each planet in order of size and distance from the sun.

Planets In Order Of Size:

Planet Diameter (km) Size relative to Earth
Mercury 4879.4  38% the size of Earth
Mars 6779  53% the size of Earth
Venus 12104  95% the size of Earth
Earth 12756  100% the size of Earth
Neptune 49528  388% the size of Earth
Uranus 51118  400% the size of Earth
Saturn 120660  945% the size of Earth
Jupiter 142800  1120% the size of Earth

Planets in order of distance from the Sun:

Planet Distance from the Sun (AU/KM)
Mercury 0.39 (57.9 million)
Venus 0.723 (108.2 million)
Earth 1 (149.6 million)
Mars 1.524 (227.9 million)
Jupiter 5.203 (778.3 million)
Saturn 9.539 (1,427.0 million)
Uranus 19.18 (2,871 million)
Neptune 30.06 (4,497.1 million)

Planets In Order Of Mass:

Planet Mass (kg)
Jupiter 1.8986 x 1027
Saturn 5.6846 x 1026
Neptune 10.243 x 1025
Uranus 8.6810 x 1025
Earth 5.9736 x 1024
Venus 4.8685 x 1024
Mars 6.4185 x 1023
Mercury 3.3022 x 1023

The Terrestrial Planets In Order

1. Mercury

The planet Mercury. Image source: NASA

The first planet in our solar system is Mercury. It is slightly smaller than Earth’s moon and is extremely hot. As in 850 Fahrenheit or so. NASA launched the MESSENGER probe in 2004 to learn all about Mercury since we don’t really know much about it.

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2. Venus

Venus is the second planet in our solar system and is named after the Roman goddess of love. Venus is actually hotter than Mercury and is abundant in greenhouse gasses. Venus is similar to Earth in size and general structure. The Soviet Union sent the probes in the Venera series to learn more about Venus that helped us learn a bit about Venus’ atmosphere, and Venera probes are actually the first manmade devices to enter another planet’s atmosphere. Cool, huh?

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3. Earth

The Earth. Image source: NASA

The Earth is the third planet from the sun and is the planet that we call home. It is the only planet, that we know of, that can maintain and support life. Earth was formed around 4 billion years ago and has gone through many changes in that time period. Earth has 4 seasons because of the tilt of Earth’s axis, and our oceans have tides because of the gravitational pull of the moon. The moon is our only natural satellite.

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4. Mars

The planet Mars. Image source: NASA

Mars is the fourth planet from the sun and is the last terrestrial planet. Mars is the focus of NASA and SpaceX because it is the only planet that humans can somewhat survive on (with the help of technology and science, of course). Mars is very cold and is currently inhabited solely by robots. Mars’ gravity is 1/3 of that on Earth, but it is enough for humans to live on.

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The Gas Giants

The remaining planets are separated from the terrestrial planets by the asteroid belt. All of the gas giants have some type of ring surrounding it.

5. Jupiter

Jupiter as seen from the Voyager space probe. Image source: NASA/JPL

Jupiter is the first of the gas giants and is the largest planet in our solar system. We got our first images of Jupiter up close from the space probe Voyager, which is actually still flying through space outside of our solar system. Jupiter is comprised primarily of hydrogen and helium and it is still unknown if Jupiter’s core is solid or not. If Jupiter were about 80 times its size then it would be considered star, just like our sun. Jupiter has a lot of natural satellites surrounding it, which are believed to be from meteors. Jupiter actually protects the Earth from meteors, so in a way, Jupiter is kind of Earth’s protective big brother.

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6. Saturn

Saturn as seen from Voyager. This is our first up-close image of Saturn. Image source: NASA

Saturn is the second gas giant and is our second largest planet. Saturn was also seen by Voyager as you can see in the picture above. Saturn is most recognizable by its rings that are made up of ice and space debris. Saturn is comprised of hydrogen and helium, but it is unknown whether Saturn has a solid core (just like Jupiter). Saturn also has quite a few natural satellites as well.

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7. Uranus

Uranus as seen by Voyager. Image source: NASA

Uranus is the seventh planet from the sun and is the third of the gas giants. Just like Jupiter and Saturn, the Voyager probe gave us our first look at the planet in 1986. Our first images of Uranus came on the same day that the Challenger blew up, killing the 7 astronauts on board.

“The crew of the space shuttle Challenger honored us by the manner in which they lived their lives. We will never forget them, nor the last time we saw them, this morning, as they prepared for their journey and waved good-bye and ‘slipped the surly bonds of earth’ to touch the face of God. ” — Ronald Reagan

Uranus has a very serious tilt to where the equator is actually at a right angle to the orbit. It is believed that Uranus had a collision with another planet, causing its tilt. The planet is made up of helium and hydrogen and is believed to have icy elements on its surface. Uranus’ core is thought to be extremely icy, instead of being molten like other planets.

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8. Neptune

Neptune as seen from Voyager. Image source: NASA

Neptune is the eighth planet from the sun and is the last of the gas giants. It is comprised of hydrogen and helium primarily and is surrounded by a thick cloud layer that houses winds faster than the speed of sound. The blue coloring is produced by an abundance of methane and it is unknown if Neptune’s core is solid. Neptune was predicted to exist by math before we actually saw it, making it the first predicted planet.

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Pluto

The dwarf planet Pluto. Image source: NASA

Pluto used to be the ninth planet in our solar system but was removed in 2006 because in all the time we’ve known about Pluto is has yet to complete an orbit around the sun. Now people have petitioned to bring Pluto back to its planet-hood, but who knows if that will happen. Pluto is only 1,400 miles wide, making it smaller than the United States. NASA sent a probe to Pluto in 2006 named New Horizons and it completed its Pluto flyby in 2015.

Planet Nine

The “last” planet on our list is Planet Nine. We have never seen this final planet, but scientists are predicting it exists (just as they did with Neptune). Nothing is actually known about Planet Nine, just that it probably exists. In the image above the bright star is representative of the sun, which is pretty dang far. This planet was predicted in 2014 after astronomers noticed that Neptune’s orbit was slightly different than some other planets. There is a theory that this planet is massive and at one point had a collision with Jupiter that “bounced” it farther away. It is merely a theory, but it’s fascinating nonetheless.

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