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Home Images from NASA’s Solar Dynamics Observatory — such as this one showing the sun as it appears in wavelengths of extreme ultraviolet light — have a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world in adding a leap second on Dec. 31, 2016. (NASA/SDO) Images from NASA's Solar Dynamics Observatory — such as this one showing the sun as it appears in wavelengths of extreme ultraviolet light — have a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world in adding a leap second on Dec. 31, 2016. (NASA/SDO)

Images from NASA’s Solar Dynamics Observatory — such as this one showing the sun as it appears in wavelengths of extreme ultraviolet light — have a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world in adding a leap second on Dec. 31, 2016. (NASA/SDO)

Images from NASA's Solar Dynamics Observatory — such as this one showing the sun as it appears in wavelengths of extreme ultraviolet light — have a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world in adding a leap second on Dec. 31, 2016. (NASA/SDO)

Images from NASA’s Solar Dynamics Observatory — such as this one showing the sun as it appears in wavelengths of extreme ultraviolet light — have a time stamp showing Universal Time on it. To maintain accuracy, SDO will join official clocks around the world in adding a leap second on Dec. 31, 2016. (NASA/SDO)