If we looked in the visible, we wouldn't even know they were there, and they're thousands of times larger than the host galaxy.
اگر ما با امواج مرئی نگاه کنیم، ما حتی نمی دانیم که آنها کجا هستند، و آنها هزاران بار بزرگ تر از کهکشان میزبان هستند