When two black holes spiral into each other, a significant amount of the combined mass is converted to gravitational waves, as detected by LIGO.
Where does that mass come from?
It would seem that any mass that is inside the event horizons cannot escape, because that would require it to move faster than light speed. Does it come from the accretion discs?
Do any of you carry while mountain biking? I live in north central Florida and recently started mountain biking again after some years off. I almost always carry concealed when I leave the house. The other day, I went biking and carried a full-sized Sig P226 in an outside-the-waistband holster, but with my t-shirt draped over it. Since the appellate court ruled that the open carry ban was unconstitutional, I’ve been less careful about trying to make sure I don’t print, especially when going out in the woods on hikes.
I just ordered an Emerald Guitars X20-12 (string) guitar. I just watched a video that talked about tuning a 12-string down to D standard (DGCFAD) to relieve some of the tension, then using a capo at the 2nd fret for E standard playing, as well as placing the capo to cover only the bottom 5 strings (at the 2nd fret) for drop-D songs. My new guitar won't arrive for several months, so I'll have to wait to try it.
Will this work well with the strings that Emerald ships (D'Addario EJ37 medium top / heavy bottom)?
I'm an intermediate-level fingerstyle player and play mostly folk music (Celtic, in particular).