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IN SPACE - FEBRUARY 15:  In a screen grab taken from a handout timelapse sequence provided by NASA / SDO, a solar spot in the centre of the Sun is captured from which the first X-class flare was emitted in four years on February 14, 2011. The images taken by NASA's Solar Dynamics Observatory (SDO) spacecraft reveal the source of the strongest flare to have been released in four years by the Sun, leading to warnings that a resulting geo-magnetic storm may cause disruption to communications and electrical supplies once it reaches the earths magnetic field.  (Image by NASA/Solar Dynamics Observatory via Getty Images)
IN SPACE - FEBRUARY 15:  In a screen grab taken from a handout timelapse sequence provided by NASA / SDO, a solar spot in the centre of the Sun is captured from which the first X-class flare was emitted in four years on February 14, 2011. The images taken by NASA's Solar Dynamics Observatory (SDO) spacecraft reveal the source of the strongest flare to have been released in four years by the Sun, leading to warnings that a resulting geo-magnetic storm may cause disruption to communications and electrical supplies once it reaches the earths magnetic field.  (Image by NASA/Solar Dynamics Observatory via Getty Images)

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Mysterious 'heartbeat' caused by sunspot cycle

NASA explains why the number of sunspots increases and decreases over time in a regular, approximately 11-year cycle.

Mysterious 'heartbeat' caused by sunspot cycle

NASA explains why the number of sunspots increases and decreases over time in a regular, approximately 11-year cycle.