European space probe Rosetta awoke from a deep sleep earlier this week to gear up for an unprecedented mission — to rendezvous and land on a comet.
In this week's Science Smart video column, Johanna Wagstaffe explains why this was such a huge milestone for space exploration in what has already been a highly-choreographed mission.
What information they hope to find out once Rosetta makes its landing in a few month? Click on the video 'play' icon above to find out.
For more information on Rosetta, visit the website for the European Space Agency.
If you have a science question you'd like answered, send Johanna Wagstaffe a tweet (@JWagstaffe) or an email: email@example.com.