Hey Brainiacs, do you know the names of all of the

planets in our solar system?

There are 8 planets in our solar system.

All of the planets orbit around the sun,

including our planet Earth.

Let's join Lizzy on the Planets Train to learn

a bit about each planet.

The closest planet to the Sun is Mercury.

It's very small and mostly made of rock.

Daytime on Mercury is really hot but the nights are

super cold, giving Mercury the biggest temperature

range of all of the planets.

The second planet from the sun is Venus.

Unlike Mercury, it's covered in a thick layer of

clouds and it's the hottest planet in our solar system.

The surface of Venus is so hot that it could cook

a whole pizza in only 3-7 seconds!

The third planet from the sun is Earth, the one we

call home. It's the only planet we know of that

contains life but scientists are constantly looking

for signs of life on other planets and even some moons.

The next planet is Mars. It's about half the size

of the Earth and the next place we're likely to

send astronauts to visit.

Scientists are hoping to send people to Mars in about 20 years.

Next up is the gas giant, Jupiter! It's the biggest

planet in our solar system and it's so big, you could

fit around 1300 Earths inside of it!

Saturn is the second largest gas giant planet and it

has a beautiful ring system around it. These rings

are made up of millions of chunks of rock and ice.

The seventh planet is Uranus and it has a smaller ring

system. Scientists think it may have been hit by an

Earth-sized planet a long time ago which might be why

it's the only planet tilted on its side.

The eighth and farthest planet from the sun is Neptune.

It's the coldest planet because it's so far from the sun.

It's also the windiest planet with winds up to

1300 miles per hour, which is almost 10 times as

strong as the most powerful hurricanes on Earth!

And those are the 8 planets of our solar system, but

there is one more object that we need to talk about.

Pluto used to be the 9th planet but now it's called a

dwarf planet because it's so small (even smaller

than Earth's moon).

We just got our first high quality photos of Pluto

in the summer of 2015 when we sent a space craft to

fly close by. And we'll be learning a lot more about

it over the next year as we get more data from the

New Horizons probe.

There is a big difference in the sizes of the planets!

Let's take a look at all 8 planets, plus Pluto, in

their actual scales next to each other.

There's tiny Mercury

Hot and cloudy Venus

Earth and its Moon

Dusty Mars

Woah! And there's gigantic Jupiter!

Saturn with all of its rings

Uranus and Neptune

And there's little bitty dwarf planet Pluto.

But of course, all of these planets are tiny when

compared to the size of the sun!

We've learned a lot about the planets over the last

100 years but we're learning more every day

and there's still a lot left to explore.

Who knows, maybe one of you will get to visit one of

these planets one day!

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Thanks for watching, Brainiacs, and see you next time!