What would it be called if a galaxy exploded
(like star from a nova or super nova)?
There’s not a mechanism by which a galaxy COULD explode. If you somehow managed to compress a galaxy together to create supernova-like conditions on a large scale, it would just collapse into a black hole. (In fact, astronomers think many galaxies already have massive black holes at their centers.)
And the name they call that is…?
A Ford with greatly diminished trade-in value.
There’s no name for it. What’s the name for an exploding cloud?
It’s possible for a galaxy to experience a “starburst” where large numbers of new stars form in a short period of time. This can cause an outflow of gas that resembles an explosion, but the galaxy itself isn’t “exploding”.
This might be close to what you’re looking for. Galaxies don’t “explode”, but there are lots of galaxies that put out tremendous amounts of radiation.
So, there is no such chance for a super black hole embracing
or sucking in via its gravitational force, a galaxy, even a small galaxy.
Pretty much not. Our own galaxy, the Milky Way, has at its core a supermassive black hole of approximately 3 million solar masses and yet we’re in absolutely no danger of being sucked in. The gravity from black hole is intense very near the hole itself, but the gravitational field gradient is just the same as it would be for a normal object of the same mass. If our Sun where compressed into a black hole, we’d all die from lack of energy, but the Earth would continue in the exact same orbit as before.
“If our Sun where compressed into a black hole, we’d all die from lack of energy…”
or boredom.
Sure, but that wouldn’t be an explosion. Once it gets sucked in, it’s not coming out again.
Quasars seem to be the result of huge amounts of gas spiraling into a galaxy-sized black hole. It’s a very violent and energetic process … but it’s not an “explosion”.
Fiction.
I think that quasars are the closest thing to an answer to the OP’s question, and the only reason one might not call them “explosions” is that they last for billions of years, but even there, the total amount of matter consumed is only a tiny fraction of the mass of the host galaxy.
A non-localized phenomenon.
The apocalypse?
But what if the black hole was the size of our sun, not compressed, with mass equal to whatever a black hole of that size would be?
We would be dead before our brains could comprehend the transition.
That’s just negative thought.
Warning! Longstanding gripe forthcoming:
I learned this back in physics class, and I don’t know how many people I’ve told it to, and not a single one has ever believed me. Maybe next time I’ll try to convince them that this really smart science guy on some Internet message board said it, too, so it must be right.
Eh, that doesn’t sound so good. I’ll stick with “My part-time adjunct professor at my community college told me so.”
That’s why I like my LTD, don’t have to worry about those pesky hypothetical explosions. (The Nova on the other hand…)
If no one else is willing to give the OP a straightforward answer, I will, in the best tradition of naming astronomical concepts like the Big Bang.
It would be called a Super-Duper Nova[sup]TM[/sup].
So there.