In space, near Speherus Magna but not orbiting it, is an octahedron roughly the size of a house. Inside the octrahedron is some fairly good cloaking tech, computer banks with the equivalent of 100 million yottabites of data, and a Great Being's digitised mind.
Oh, and there's no oxygen. Why would a computer need one?
Watching the events on the Forgotten Starfleet, Binary realises he needs to take action against the Composer. If he didn't, things would die. Great Beings dying wasn't a problem, but he couldn't let his creations burn.