Page last updated at 08:56 GMT, Wednesday, 10 February 2010

Ten years of solar activity

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A new mission that will help unravel the secrets of the Sun is set to launch.

Nasa's Solar Dynamics Observatory will acquire detailed images of our star to try to get a better understanding of why it behaves the way it does.

It will help to answer questions about why and how the Sun's activity varies year on year, as shown here from this footage taken between 1996 and 2005 by Esa and Nasa's Solar and Heliospheric Observatory (Soho) mission.

Footage courtesy of SOHO/Extreme Ultraviolet Imaging Telescope consortium

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