This was meant to be the replacement for the Hubble Space Telescope, with a bigger mirror and the capacity to capture images from farther away. Envisioned in 1996, it was supposed to launch in 2007 at a cost of $1 billion. Now, it sits at $9.7 billion and has been delayed until 2021.

The reason for the delay is all about human error. From incorrect cleaning solvents and lose screws, the engineers have had a heck of at time getting it done. But it’s been confirmed that as of August 2019, it’s completely finished. That’s something.