[OBAFGKM]

!@#!#@%!!

It was luminiferous ether -- not "luminous," and it had nothing whatsoever to do with gravity.

[epluribus_2]

well, kindof, since it was thought that waves in the ether pushed the planets around...

[VadeRetro]

It was luminiferous ether -- not "luminous," and it had nothing whatsoever to do with gravity.

You beat me. From your screenie, you might be a good one to ask about my question in post 14. Are astronomers allowing for at least one black hole per galaxy and still stumped?