41–50 of 69 posts
Earlier quoted context omitted.
It's streaming live right now!
Where!?
Not sure if anyone is relaying it over the Internet, but I looked it up, and the remnants will last for at the very least hundreds of years:
Earlier quoted context omitted.
Where!?
I presume they mean in the sky. Not sure if anyone is relaying it over the Internet, but I looked it up, and the remnants will last for at the very least hundreds of years: https://en.wikipedia.org/wiki/Supernova_remnant
Earlier quoted context omitted.
I presume they mean in the sky. Not sure if anyone is relaying it over the Internet, but I looked it up, and the remnants will last for at the very least hundreds of years: https://en.wikipedia.org/wiki/Supernova_remnant
Ah but nowhere to see a livestream of from JWST right now?
> The star collapses in an explosion Can anyone explain the above phrase?
This is usually balanced and you have a nice star. When the fusion slows as the star exhausts fuel, gravitational pull dominates and everything falls inward in a collapse. That presses the inner bits together nice and tight, and then the outer bits bounce off it.
So you have a collapse inward with an explosion as everything bounces off. Wikipedia has a nice picture.
Earlier quoted context omitted.
Ah but nowhere to see a livestream of from JWST right now?
I'd like to know too. I wonder if they have something like CERN for open data and streaming: https://opendata.cern.ch/
Amazing photo. At the end of the Netflix documentary about JWST "Unknown: Cosmic Time Machine" they state the telescope data would be available for everyone to use. Is that actually true, or did they mean just these full res images?
https://jwst-docs.stsci.edu/getting-started-with-jwst-data seems like a good spot to start.
Earlier quoted context omitted.
Our sun isn’t massive enough to ever go supernova.
Supernova are powerful enough that even a star in a different solar system going nova can kill you, if it's a "nearby" system. But I believe there aren't any stars close enough that would go supernova any time soon.
I think, ball park, a SN 500 light years out is considered safe e.g. Betelgeuse. Our Milky Way galaxy is thought to be roughly 100,000 light years in diameter so we should be safe from all but those within about a hundredth of the radius of our galaxy from us.
space is big ...
> The star collapses in an explosion Can anyone explain the above phrase?
The part keeping a star together is its gravitational pull to all of its pieces. The part keeping it from collapsing is the outward push of its fusion (and also the electrons pushing against each other since they can't all occupy the same space). This is usually balanced and you have a nice star. When the fusion slows as the star exhausts fuel, gravitational pull dominates and everything falls inward in a collapse. T…
https://archive.org/details/collapsinguniver0000asim>
Stars are a contest between gravity and the nuclear strong force, with stellar fusion creating the heat and pressure required to resist, at least for a time, the pull of gravity. The larger a star, the faster it burns through its hydrogen fuel. While brown dwarf stars may have liftimes in the trillions of years, our Sun will expend all its fuel in about 11-12 billion years (it's about half-way through that process now), and will gradually grow hotter and brighter as it does so (it's already about 25% brighter than it was when the Earth was formed). The largest stars have lifespans of only a few million years, roughly dating to when the proto-hominids diverged from their last common ancestor with chimpanzees, and far more recently than the dinosaurs died out.
It's a useful lesson to recall that bigger and more energy-hungry does not necessarily mean longer-lived, and quite often means precisely the opposite.
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/startime.ht...>
https://en.wikipedia.org/wiki/Stellar_evolution>
Earlier quoted context omitted.
Supernova are powerful enough that even a star in a different solar system going nova can kill you, if it's a "nearby" system. But I believe there aren't any stars close enough that would go supernova any time soon.
A good premise for a sci-fi series: In the distant future, a large fleet of earth's best and brightest travels the stars while desperately trying to invent Earth's last ditch-effort to save its 12 billion inhabitants from a soon-to-be cataclysmic, near-earth supernovae: FTL travel. After decades of progress finally nears fruition, the fleet permanently loses contact with earth; humanity's home Solar System's remnants…