* Astronomy

Take part in ESA's Cool Comet Campaign
 
Do you use Twitter? Are you as intrigued by comets as we are? Then tell us 'Why comets are cool' and you might win a trip to ESA's operations centre in Germany on 15 June to celebrate 25 years of cometary science at ESA.
To take part, simply tweet your entry. It must include the "#coolcomet" hashtag, leaving you a mere 130 characters, so brevity is important.
Your tweet may also include a single URL, or weblink, that links to a 'non-text' submission, such as a picture, image, photo, animation, video, audio file or any other sort of digital content.
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