that I’ve read in the past (and the good ol’ Mac’s onboard dictionary, boom boom!) a ‘black hole’ is something from which nothing can escape.
Hence the so-called ‘event horizon’. All well and good so far—but wait, it gets better …
—so effectively the black hole doesn’t exist, just its effects. And if such two collide, they gobble each other up and sum (?) those effects. Okayyyyy so far …
“According to general relativity, a pair of black holes orbiting around each other lose energy through the emission of gravitational waves, causing them to gradually approach each other over billions of years, and then much more quickly in the final minutes. During the final fraction of a second, the two black holes collide into each other at nearly one-half the speed of light and form a single more massive black hole, converting a portion of the combined black holes’ mass to energy, according to Einstein’s formula E=mc2. This energy is emitted as a final strong burst of gravitational waves. It is these gravitational waves that LIGO has observed.”
Read from source by clicking: HERE
(With many thanks for the link to Jim: CLICK HERE
But I’m still in the dark about the propagational properties of those ‘gravitational waves’—they seem to travel through the ether like electromagnetic waves but are different(?).
I did read some stuff to the effect that “… yes, they’re not—massive objects don’t emit ‘waves’ per se but they have the effect of distorting Time and Space.”
The illustrating analogy we had to imagine was a bowling ball resting on a flexible surface (in those days a sheet of rubber, these days possibly graphene*?) creating a deepish dent. We then rolled an imaginary marble in a straight line across the dent … and lo!, our bearing goes into a wee orbit around the ball until things happened.
I keep getting unstuck relating concepts—if gravity is the dent is in space/time as some great mind postulated, how can gravity ‘travel’? But if it’s a waveform … how fast does it travel?
And if time travels at the speed of light—then the referenced collision of billions of years ago only just happened, no?
Oh no … overload …
“Oogle phleep! Beam me up, Scottie! Give it wings!”
(The management apologises for the temporary loss of Argus. He’ll be back when his Spouse finishes slapping him with that wet mop) (Don’t wait up, it may be some time.)
Until normal service is resumed here’s a mushroom from this season’s crop—
—and it too is made of star-stuff.
* Aaaaah, progress! She can’t be beat … and thanks to Google pics for the cat. (He was delicious.)