There are billions of galaxies in the
universe. Each galaxy has got billions of solar
systems! Everybody knows that, right? Well,
there's more!
Our galaxy, the Milky Way, has got up to
400 billion stars, and one of them is the sun.
The sun is in the centre of our solar system
and all the planets move around it. It is
important for life on Earth because it gives us
light and heat.
Our solar system has got eight planets,
not nine like we used to think: Mercury,
Venus, Earth, Mars, Jupiter, Saturn, Uranus
and Neptune. Scientists don't consider
Pluto a planet anymore, but a dwarf planet.
because it's very small. So, the smallest
planet in our solar system is Mercury and
the biggest is Jupiter. Also, the closest
planet to the sun is Mercury, but it isn't the
hottest. The hottest planet of all is Venus, but
don't think you can sunbathe there: it has
temperatures of about 460°C! Neptune is the
farthest planet from the sun, and it is one of
the coldest planets of the solar system along
with Saturn and Uranus. Temperatures on
Neptune can reach-220°C!



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