"The first part of the video from SDO, (taken in 171 Angstrom wavelength, which is typically shown in yellow) was filmed on Dec 15, 2011 showing Comet Lovejoy moving in toward the Sun, with its tail “wiggling” from its interaction with the solar wind. The second part of the clip shows the comet exiting from behind the right side of the Sun, after an hour of travel through its closest approach." Nancy Atkinson
