Per his agreement with the copyright holders of David Bowie's "Space Oddity," Canadian astronaut Chris Hadfield will take down the video of himself doing a rendition of the song while aboard the International Space Station.

The video was edited by Hadfield's son and posted to YouTube in March 2013, while the astronaut was still aboard the space station. It quickly went viral. As of today, the video has racked up more than 22 million views.

While that sounds like a lot of views -- and even by viral YouTube video standards it is -- 22 million accounts for less than one-third of a percent of the world's population. That means there are millions, if not billions, of people out there who still haven't seen the music video.

Which begs the question: what are they waiting for? There are only a few hours left before it disappears from the Internet.

Unlike many viral video stars, Hadfield's fame extended offscreen. Once returned home from the ISS, the astronaut quickly became a public figure. Touring the world discussing his time in space, playing "Space Oddity" live, and even writing a book.

Hadfield's son, Evan, told Mashable there is still hope the video will be revived in the near future. "We are working on getting it back up," he said, "but there are few promises with something as complicated as videos from space."