Two of them were ready to jump into spacewalking action one last time if the telescope's aperture door had not opened telescope on Tuesday morning or some other last-minute problem cropped up.
What does AD stand for?
AD stands for Aperture Door
This definition appears frequently and is found in the following Acronym Finder categories:
- Information technology (IT) and computers
See other definitions of AD
We have 84 other meanings of AD in our Acronym Attic
- Ante Diem
- Antidumping Duty
- Antimatter Decelerator
- Antonio Davis
- Aperture Card Diazo