The photo shows Half Dome, a tourist attraction in Yosemite National Park, California, taken in October 2019. On the same day, at the same location, and with the same camera, 28 panoramic photos and 174 star background photos were combined. The blue star cluster visible in the upper right of Half Dome is the Pleiades. The Pleiades formed about 100 million years ago and is located approximately 450 light-years (1 light-year is the distance light travels in one year, roughly 9.46 trillion kilometers) away, and it is expected to last for about another 250 million years.
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