Astronomy news update from NASA :
That's no sunspot. It's the
International Space Station (ISS) caught passing in front of the Sun.
Sunspots, individually, have a dark central
umbra, a lighter surrounding penumbra, and
no solar panels. By contrast, the
ISS is a complex and multi-spired mechanism, one of the largest and most sophisticated machines ever created by
humanity. Also, sunspots occur on the
Sun, whereas the
ISS orbits the
Earth. 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.
from NASA https://ift.tt/2JHcGsB
via
IFTTT
