Welcome to Bedtime History. Hello, this is Brec.

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Tonight we're going to talk about comets. Have you ever heard of a comet?

A comet is a gigantic piece of ice and rock and dirt that flies through outer space at incredible

speeds. Many comets for the size of mountains and when they speed around space have a tail of

gases that can be hundreds of thousands of feet long. For a long time humans have seen comets in

the sky and wondered what they are. Some very smart scientists decided they wanted to learn more

about comets so they decided to create a spaceship that would find a comet and land on it.

This had never been done before but they knew if they built the spaceship right and worked out

all of the math correctly they could make it happen. Many different countries in Europe

designed and started working on the spacecraft they would call Rosetta. It took many different

engineers and scientists studying space and spaceships to know how Rosetta should work.

Astronomers who were scientists who know about space also had to follow the comet Rosetta would land on.

They had to use math to figure out how fast Rosetta should go and where it should land

...