New case of NASA covering up UFO proof?

It is alleged that NASA has erased images contained in online archives that show what might be giant spaceships from other civilizations in the universe, travelling within our solar system (See video below).
A UFO enthusiast ( https://www.youtube.com/user/BeePeeOilDisaster ) who painstakingly went through NASA's STEREO website archived pictures and discovered the UFO images became suspicious, when after posting the images on YouTube, he was accused of hoaxing by viewers claiming the objects were not in the original pictures.
He was relieved when other viewers contacted him alleging they had seen the UFOs in the original images. Curiously, some of the URLs of the images had changed after NASA's alleged airbrush job.
The question being asked now is why is NASA and the rest of Earth's power structure so terrified of letting people know the truth and what does NASA know about ETs?
For more details watch the video below and read the full description on its YouTube page. Also, for up to date UFO video news consider subscribing to All News Web's Youtube channel.

Great article thanks Terrestrial.
Crystal