A recent UFO sighting has intrigued and alarmed enthusiasts due to its close proximity to the International Space Station.

First reported by UFO Sightings Daily Scott Waring, the sighting was caught on the NASA live cam of the Space Station yesterday.

"This object was visible slightly and seemed to match the stations speed," writes Waring on his website.

"The object is solid, yet on the right side there is a distortion which is caused from its power source. Sadly I lost it when the screen went black but I'm sure we will see it again soon."

Check out a video of the UFO sighting below:

The NASA live cam is famous for spotting unexplained phenomena, like the UFO sighting above, as well as others.

In fact, a recent sighting was underwater!

But a sighting like the most recent one has been seen before. Another video caught on the live cam November 16 of last year depicts a similar orb-like UFO.

And some believe this to be a sign that aliens are spying on the International Space Station.

What do you think? Are these UFO sightings valid, or are they simply natural space occurrences near the Space Station?

Watch the videos and let us know.