News for hackers. Stuff that matters.

A comment on The Milky Way's black hole may spring to life in 2013. Parent comment

Re:The Milky Way's black hole may spring to life in 2013 by bakedbeing on Wednesday December 14, 2011 @09:00PM (#3354702)
Only if gravity moves at the same speed as light, right? It sounds like we've been observing energy emissions (light) rather than directly observing it's gravitational impact on us.
[ Parent | on HN ]
Re:The Milky Way's black hole may spring to life in 2013 by ars on Wednesday December 14, 2011 @09:02PM (#3354709)
Gravity has to move at the same speed as light. If it didn't it would cause time paradoxes.
[ Parent | on HN ]
Re:The Milky Way's black hole may spring to life in 2013 by bakedbeing on Wednesday December 14, 2011 @09:17PM (#3354751)
Ah of course, a theoretical graviton being a massless particle. That's what I get for not having a wee Google first.
[ Parent | on HN ]
Re:The Milky Way's black hole may spring to life in 2013 by awj on Thursday December 15, 2011 @01:35AM (#3355243)
My understanding (note: I am not a physicist, this is not a physics lesson) agrees with ars, gravity has to move at the same speed as light.

In either case, the energy emissions potentially are enough, if they're directed at us and strong enough.

[ Parent | on HN ]