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The bizarre footage shows part of the space station looking out onto a black nothingness.

For no apparent reason, the dark outlook begins to get lighter as some sort of circular object floats past.

It continues to get lighter and lighter as the shadow is lifted.

(Image: YOUTUBE/STREETCAP1)

In his caption to the video, he pointed out he wasn’t for certain saying it was a “huge mothership or any sort of alien spacecraft” but that it “certainly looks unusual”.

Alien enthusiast Streetcap1 posted the footage to his YouTube channel on Saturday (March 19).

As he watched the mysterious shape move past, he said: “You see a big shadow coming across the picture.

“Look at that – what on Earth can that be?”

But some of his loyal fan base did reach the conclusion it was proof of extraterrestrial life.

“OMG, a mothership,” one user wrote.

Another added: “Some f***** up s*** is going on out in space and it’s slowly becoming known. Be aware I’m pretty sure more events are still to come.”

(Image: YOUTUBE/STREETCAP1)

Other followers suggested it could have been the filter in the camera moving out of screen, or simply the sun’s light coming around.

But one viewer pointed out: “The background is completely obscured by whatever that large object is.

"How can it be a shadow or an eclipse?”

It comes after another strange video surfaced claiming to show alien crash sites on the moon.

And there are some that believe alien bases still exist on the moon.