As we’re looking at SN 2023ixf I decided revisit this lecture. This makes me wonder, at what distance would a SN actually be a danger to us earthlings?
The exact distance is not know, but it is generally believed that anything less than 50 light years would probably present a real problem for life on Earth.
Another cliff hanger series... What about the Neutron Star? What about the synthesis of the heavy elements beyond iron? Can't wait to see what happens next... keep up the good work!
+sparkstarter In the previous video he explains that you can't go beyond iron to heaver elements in normal star fusion as it is an endothermic nuclear reaction. i.e. it absorbs energy, which reduces the core temperature leading to a fall of radiation pressure. The heavier elements are created during the supernova when the iron collapses in on itself due to this reduction of pressure.
It occurred to me that a Photon is mass less. So wouldn't it be safe to say from the Core of a black hole to the Schwarzschild radius the distance would be so far and the light from the core would be so far red shifted that it would appear black. In other words space-time would be warped beyond the speed of light from the singularity to the the Schwarzschild radius that no light would escape. Taking in to account the conservation of angular momentum and the warping of space-time Due to what Einstein called frame dragging. Inside the Schwarzschild radius would be blinding as photons would orbit the singularity.
Type IIb supernovae are very rare and are indeed more difficult to confirm. The causes of the observations can only be theorized, but all the theories try to explain why there is such small amount of H present. The most prevailing theory is that the outer layers of the star which contained the bulk of the H were expelled before the explosion.
![C02. FUNÇÃO EXPONENCIAL [98]](http://i.ytimg.com/vi/ckr7VSaSbjQ/mqdefault.jpg)
As we’re looking at SN 2023ixf I decided revisit this lecture. This makes me wonder, at what distance would a SN actually be a danger to us earthlings?
The exact distance is not know, but it is generally believed that anything less than 50 light years would probably present a real problem for life on Earth.
Another cliff hanger series... What about the Neutron Star? What about the synthesis of the heavy elements beyond iron? Can't wait to see what happens next... keep up the good work!
+sparkstarter In the previous video he explains that you can't go beyond iron to heaver elements in normal star fusion as it is an endothermic nuclear reaction. i.e. it absorbs energy, which reduces the core temperature leading to a fall of radiation pressure. The heavier elements are created during the supernova when the iron collapses in on itself due to this reduction of pressure.
Something falls from the upper left at 1:36
The thing that fell appears to be luminous, weird?!
yeh, and it dissapeared from half way.
It occurred to me that a Photon is mass less. So wouldn't it be safe to
say from the Core of a black hole to the Schwarzschild radius the
distance would be so far and the light from the core would be so far red
shifted that it would appear black. In other words space-time would be
warped beyond the speed of light from the singularity to the the
Schwarzschild radius that no light would escape. Taking in to account
the conservation of angular momentum and the warping of space-time Due
to what Einstein called frame dragging. Inside the Schwarzschild radius
would be blinding as photons would orbit the singularity.
Thank you very much^^/// I will practise more English so I can understand this more.
how Type Ia and type IIb are detected as in both the case no H2 and no He is there. I mean to say how they are distinguished?
Type IIb supernovae are very rare and are indeed more difficult to confirm. The causes of the observations can only be theorized, but all the theories try to explain why there is such small amount of H present. The most prevailing theory is that the outer layers of the star which contained the bulk of the H were expelled before the explosion.
Thank you. Can you tell me something about SN2018 Cow? It is the hottest topic to discuss when it comes to supernova.
thx!!!
char wjitg ne in Banghadesh Accra Senegal Daccae ha
I didn't quite get that.