Culture and Religion

A world view where the guide for society is based on human nature,
 not on ancient scriptures.  Home  or Topic Groups

Understand a Black Hole

the post:
NASA just recorded a black hole devour a sun-sized star for the first time ever.

then several comments:

===
 I think the biggest one they found so far was 66 billion solar masses there is no way a star is going to get that big to collapse into a black hole

===
Just trying to understand that's all
===
my comment:
To understand a black hole it helps to recognize first why it is so important to cosmology.
Nearly every galaxy has an X-ray source but no visible object due to the dust.
Cosmologists need to explain that X-ray source.

There is a good youtube video if you search for: "thornhill plasmoid"

A plasmoid does not exist in modern cosmology which ignores electromagnetic forces.

Cosmologists cannot explain an X-ray source conveniently so they propose a black hole with an accretion disk. The black hole can be assigned whatever incredible number of solar masses as needed for whatever they need. The simple rule is the number of solar masses increases in the SMBH with the number of stars in the galaxy.

This  black hole has so much gravity it  can cause a surrounding disk of material to heat to such an extreme temperature so its thermal radiation extends to X-ray wavelengths.
This mechanism has never been duplicated.

from a post at the University of Cambridge Institute of Astronomy, about thermal emission:

===
To be hot enough for the peak of emission to be in the X-ray range the material would have a temperature of around 300,000-300,000,000K.
===

my comment:

This is absolutely unbelievable for material in an accretion disk (not fully compressed but loose enough so internal friction causes this heat) to reach this extreme temperature and remain intact.

People forget the only viable source of X-rays is synchrotron radiation.

Excerpt from the European Synchrotron Radiation Facility site:

===
Synchrotron radiation was seen for the first time at General Electric in the United States in 1947 in a different type of particle accelerator (synchrotron). It was first considered a nuisance because it caused the particles to lose energy, but it was then recognised in the 1960s as light with exceptional properties that overcame the shortcomings of X-ray tubes.

In the mid- to late 1970s, scientists began to discuss ideas for using synchrotrons to produce extremely bright X-rays.

The entire world of synchrotron science depends on one physical phenomenon: When a moving electron changes direction [ in a magnetic field], it emits energy. When the electron is moving fast enough, the emitted energy is at X-ray wavelength.
==

my comment:

A plasmoid is a source of synchrotron radiation extending to X-ray.

Black holes do not exist but cosmology needs them as an X-ray source.
Hit back to go to previous page in history.

Here is the list of topics in this Cosmology Topic Group .

Ctrl + for zoom in;  Ctrl - for zoom out ;  Ctrl 0 for no zoom;
triple-tap for zoom to fit;  pinch for zoom change;  pinched for no zoom