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How many supernova explode every year?

badastronomy.beehiiv.com

41–50 of 196 posts

Re: How many supernova explode every year?

#41

That's one of my favourite hints in Outer Wilds. You will see a Supernova. Not with a fancy telescope, it's visible to the naked eye, and if you watch the sky you'll see another soon enough. You can see this right at the start, and unlike the random direction of the probe launch you don't need any game lore to, if you're smart enough, put two and two together.

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Re: How many supernova explode every year?

#43
post #27

Earlier quoted context omitted.

It's fun to think that at some point it will be actually vast and completely dark

We have a couple trillion years to figure out a way to fix that.

We don’t need to fix that, do we? Just let it be. You’ll be long dead anyway.

Re: How many supernova explode every year?

#44
post #4

We're dealing with the sum total of everything, if the true nature of things is that there are a finite number of supernovas I'd be surprised. The real shock is how small the number of supernovas is and how young everything seems to be in the known universe (the age of the observed universe is estimated at maybe double digit billion years). These are tiny numbers given that we're quite possibly dealing with infinity…

its 1 supernova per century per galaxy. there are many galaxies: more than 10 stars go supernova every second across the universe. tens of thousands have gone supernova since the article was posted to HN. tiny percentages in a large sample are huge numbers, you might even say 'astronomical'.

Re: How many supernova explode every year?

#45
post #27

Earlier quoted context omitted.

We have a couple trillion years to figure out a way to fix that.

We don’t need to fix that, do we? Just let it be. You’ll be long dead anyway.

> We don’t need to fix that, do we? Just let it be. You’ll be long dead anyway.

Spotted the republican

Re: How many supernova explode every year?

#50
post #42

Earlier quoted context omitted.

Does it need fixing?

Since I'd like to live forever, then yes.

What you really want to do is put out the stars sooner then, and feed all the hydrogen into the supermassive black hole at the center of the galaxy. Dump in all the mass in the galaxy and all of its satellites and everything from Andromeda and its satellites too and it will grow. Nudge Andromeda’s central black hole into orbit around ours so that they merge, etc, etc. Grow it big enough and and you can build a Birch World around it, with a surface area larger than all the planets in those galaxies put together. All of the exploration with none of the boring travel in between interesting places! You can seed it with life from every planet your civilization ever encountered and watch all those ecosystems compete and hybridize as you while away the years. How many years would you have?

While dumping matter into a black hole destroys the matter, it doesn’t destroy the mass. It just confines all of the mass in one place. Powering your Birch World is just a matter of using the Penrose process to extract energy from the black hole for the next few million trillion trillion trillion trillion trillion trillion trillion years (about 3×10¹⁰⁴ years give or take a few). The stars will only last for about a million trillion years (10²⁰ years plus or minus a bit), so this plan extends your your lifetime by a factor of a trillion trillion trillion trillion trillion trillion years.

Maximal extension perhaps, but not quite forever. Forever takes a lot more work.

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