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What are you talking about? The primary mirror on Hubble has a diameter of 2.4 meters while the Habitable Worlds Observatory will have a diameter of 6.5 meters. This is the same size as Webb but operates at much shorter UV and visible wavelengths yielding superior resolution (with a range of technical advances required over Webb which operates primarily at longer IR wavelengths).

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Stellarium Plus (the paid version) has comets, search for "ZTF"

If it's being hard to see, here's a general guide: https://skyandtelescope.org/astronomy-news/spot-circumpolar-comet-ztf-c-2022-e3-in-binoculars/

I should dig out my bins!

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We are pretty confident we understand black holes of a range of sizes, but we still can't say for sure that some fundamental particles are not actually themselves little black holes, or if the whole universe is swarming with little black holes somehow. This idea of white holes isn't discussed much. You wouldn't expect to see one in space, unless you mean by viewing the big bang as a white hole - it is, after all, a region of space that light and matter cannot enter. And it is thought to gravitate; we initially thought expansion would slow from all the matter pulling on itself. A white hole would gravitate, just like a black hole, so you could 'orbit' it, assuming it wasn't spitting out light or matter. And we're kind of orbiting the big bang; only it happened everywhere at once, so that involves a lot of sitting around.

I'm not sure how else one might mean opposite; there is the unruh radiation... like, you could look at the furthest reaches we can see, and think about how we relate to a singularity. There might be some interesting symmetries. It's above my head.

The wave mechanics of gravity are complex; regions of space can focus gravitational waves, or spread them. Space is warped by 'frame-dragging' around a spinning black hole. And we don't quite get either dark matter or dark energy.

In short, the easiest opposite is the time reversal. Black holes are closed-off regions of space; they have properties that seem bizarre to us. Their opposite is either not bizarre, or just bizarre after having been put through a Wick rotation.

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The better question is what gets expelled from black hole mergers?

Nothing is infinite, even if it is a number so large it is beyond a primate’s comprehension. Black holes are using their immense gravity to convert matter into energy and expel it as radiation. A very inefficient process, but absolutely stunning.

All elements heavier than lead were forged by the collision of two neutron stars, as a main sequence star quickly dies after becoming ferrous, as there is no more energy to be gained by fusion of heavier elements, and supernovae rarely form fusion reactions past lead.

That’s mind boggling to try and even fathom… The heavier than lead elements started as super giant stars that turned into neutron stars at death, then later merged with another, to explode its strange matter into the cosmos.

White Holes are a layman’s cop out for misunderstanding the rules of Black Holes.

It seems like non-understanding on your part

Particles are always coming in and out of existence. I assume this is also true within black holes (and other types of matter). It's also true of empty space.

The mass of black holes is, I assume, always fluctuating because of this. So is the mass of empty space

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If you like or prefer videos, Dr Becky, PBS SpaceTime, Anton Petrov, Scott Manley are excellent starting points.

I may need to do the same.. :)

> I've only done basic high-school science

Same (on paper anyway), but I've read a lot since then because it's interesting ;)

Indeed, my phone is blowing up a bit now😅

I don’t know but it’s fun to think about.

Ok good to know

That's quite interesting and yeah I don't claim to have any knowledge either just thinking aloud as well.. :)

An additional question then, and I get that but I mean a large area being empty 100% of the time like a black hole being dense 100% of the time

If you réalisé that why are you asking?

Most of space is empty space. At least at times as it seems that particles pop in and out of existence.

I'm not a scientist either but if that were true than is our feasible view of existence just a small marble in a larger universe we cannot see, meaning all we can see and know is just the back of another much much larger black hole and that black hole is the center of our "existence" where the believed big bang occurred... idk just a guess

If white holes are a thing, and the big bang is an example of a white hole, then I'm not sure how a white hole and a black hole could exist in the same space in order for them to collide?

If all of the matter in the universe came from a white hole, then prior to this there would be no matter to form the density required to create a black hole. And surely if there were any such matter then the mass of the 'white hole' would supercede that of the black hole and as such would have already swallowed it up.

Not claiming to have any great knowledge on this stuff, by the way. Just thinking out loud...