This is the 11349th most frequent German word.
spacex
The word "spacex" is not a German word; it refers to the American aerospace company SpaceX.
Here, 'SpaceX' is used as a proper noun referring to the company.
SpaceX ist ein innovatives Raumfahrtunternehmen.
SpaceX is an innovative space exploration company.
'SpaceX' serves as the subject connected to the action of making announcements.
Ich habe eine Ankündigung von SpaceX gelesen.
I read an announcement by SpaceX.
In this case, 'SpaceX' is used possessively to describe ownership of the rockets.