2 ms·Gravitational Waves Continue to Astound2 points by nsoonhui 4y agozeristor 4y agoI wonder how long before we witness a super massive black hole collision. Either two meeting together, or one and a far smaller one. I guess this would be noticeable for decades before if they were close enough.ipspam 4y agohttps://archive.ph/GqqiB https://archive.ph/GqqiB