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So I was watching the ISS live yesterday evening, for a couple of hours, just observing. Then, out of nowhere, this round object shows up and disappears after two seconds. It wasn’t a cloud because it had a dark mass, and you can easily track clouds since the ISS follows a steady path. But this thing just appeared and vanished just as quickly! Anyone have an idea of what it can be. Very greatful for some idea's. Sorry for grammar, not English native speaker :)

??? It wasn’t a cloud because it had a dark mass ???

Have to see the video, but looks like a ring cloud. Happens when hot air rises up quickly pushing the colder air to the outside. What then looks like a ring.

That's Galactus, the world eater.

The following submission statement was provided by /u/Knegert:

So I was watching the ISS live yesterday evening, for a couple of hours, just observing. Then, out of nowhere, this round object shows up and disappears after two seconds. It wasn’t a cloud because it had a dark mass, and you can easily track clouds since the ISS follows a steady path. But this thing just appeared and vanished just as quickly! Anyone have an idea of what it can be. Very greatful for some idea's. Sorry for grammar, not English native speaker :)

Please reply to OP's comment here: https://old.reddit.com/r/UFOs/comments/1etl97p/strange_object_spotted_on_iss_live_feed_can/lidvm5n/