For ten years now, NASA’s Solar Dynamics Observatory has been capturing an image of Sol every 0.75 seconds from geosynchronous orbit around the earth. In this mesmeric hour long video, every second represents a day in the sun’s life, with various noteworthy events highlighted. To wit:
12:24, June 5, 2012 — The transit of Venus across the face of the Sun. Won’t happen again until 2117.
13:50, Aug. 31, 2012 — The most iconic eruption of this solar cycle bursts from the lower left of the Sun.
43:20, July 5, 2017 — A large sunspot group spends two weeks crossing the face of the Sun.
Aggh! It’s a TIE fighter. No wait, it’s a sunspot. No wait, it’s the International Space Station. But what’s it doing on the Sun? To wit:
Transiting the Sun is not very unusual for the ISS, which orbits the Earth about every 90 minutes, but getting one’s timing and equipment just right for a great image is rare. Strangely, besides that fake spot, in this recent two-image composite, the Sun lacked any real sunspots. The featured picture combines two images — one capturing the space station transiting the Sun — and another taken consecutively capturing details of the Sun’s surface. Sunspots have been rare on the Sun since the dawn of the current Solar Minimum, a period of low solar activity. For reasons not yet fully understood, the number of sunspots occurring during both the previous and current solar minima have been unusually low.