Here's a little bonus astrophotography post for you. This is the same star trails picture that I put up a few weeks ago, but while I was messing around recently on the NASA site I realized that it probably showed something interesting. And it does:
I grayed out the image except for the part I've pointed to. In a normal star trails photo, the trails are circular because they're a result of the rotation of the earth against a motionless sky. However, comets have some motion of their own, which makes their trails slightly non-circular. And sure enough, if you look closely at the trail I pointed to,¹ it's not quite concentric with the one to its right. This is a sign that it's a comet, not a star.
¹As always, click to embiggen!
Huh. Could've fooled me. I can barely see the difference even with the picture enlarged.
The tail is barely crossing a circular star trail, is that what I'm supposed to see?
The trendline is non-circular
That is the cleanest "spot the comet" trick I've ever seen. The green is nowhere near as obvious as the color in some of the other objects for some reason ...
I dunno. Using that trick I think I can find at least several other comets elsewhere in the photo…
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Brilliant, Kevin. Very nice.
Aye...It's...it's green...
Just you and me...put him right under the table.
That's a good catch!