Long, long ago men and women on Earth gazed in wonder at comets that appeared in the sky. What where these mysterious objects? Rosetta and Philae learn about the history of comets from their grandfather, Giotto. <br /> <br />This video is also available in the following languages: <br />German: http://youtu.be/TCUPKctIJcs <br />Spanish: http://youtu.be/07PjU9kJ7uI <br />Italian: http://youtu.be/UoHSiDz8u38 <br />French: http://youtu.be/LArEprzylNY <br /> <br />More videos in the series are available in this playlist: <br />https://www.youtube.com/playlist?list=PLbyvawxScNbui_Ncl9uQ_fXLOjS4sNSd8 <br /> <br />Credit: ESA
