Probably quite a few. The image description on the website gave a single frame of the exposure, and judging by the quality compared to the final image, there was probably a lot of these stacked on top of one another.
Of course, it's a stunning photo! I actually posted it yesterday morning since it was Sunday for me in Australia (it's now nearly 1:30 AM on Monday for me), but it was removed for it not being posted on Sunday. I forgot most of Reddit goes by USA time, so it was actually Saturday afternoon in the USA when I posted it. lol
Description: Comet-like plumes are blowing over the volcanic peaks of Mount Etna in this wintry mountain-and-skyscape from planet Earth. The stacked and blended combination of individual exposures recorded during the cold night of January 23, also capture naked-eye Comet ZTF just above Etna's snowy slopes. Of course the effect of increasing sunlight on the comet's nucleus and the solar wind are responsible for the comet's greenish coma and broad dusty tail. This weekend Comet ZTF is dashing across northern skies between north star Polaris and the Big Dipper. From a dark site you can only just spot it as a fuzzy patch though. That's still an impressive achievement if you consider you are gazing at a visitor from the distant Oort cloud with your own eyes. But binoculars or a small telescope will make for an even more enjoyable view of this Comet ZTF in the coming days.
Comet ZTF over Mount Etna by Dario Giannobile
SuppressiveFire OP t1_j6dqtuk wrote
Reply to comment by desucca in Comet ZTF over Mount Etna by Dario Giannobile by SuppressiveFire
Probably quite a few. The image description on the website gave a single frame of the exposure, and judging by the quality compared to the final image, there was probably a lot of these stacked on top of one another.