Last updated at 16:29

How does a spacecraft land on a comet?

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Space history has been made today after special probe Rosetta finally caught up with a comet it's been chasing for 10 years.

Since we told you about it this morning the craft has become the first ever to enter a comet's orbit.

Now landing on a comet is a tricky task, so Newsround got space expert Tim O'Brien to tell you how it works.