Are black holes really the cookie monsters of the universe?

AI Thread Summary
Scientists have observed a black hole named Swift-J 1644+57 consuming a star, marking a rare astronomical event that occurs approximately once every 100,000 years per galaxy. This phenomenon highlights the extreme gravitational effects of black holes, which can rip matter from nearby stars due to their immense mass and compact nature. Unlike neutron stars, which also have strong gravitational pulls and can create accretion discs, black holes possess an event horizon that prevents light from escaping once crossed. The discussion emphasizes the unique characteristics of black holes in comparison to other celestial bodies. Understanding these events can provide deeper insights into the dynamics of the universe.
clearwater304
Messages
88
Reaction score
0
http://whoknew.news.yahoo.com/who-knew/black-holes-27425876.html
 
Last edited by a moderator:
Space news on Phys.org
clearwater304 said:
http://whoknew.news.yahoo.com/who-knew/black-holes-27425876.html

This is a public service:

1] Blurb: "For the first time, scientists spotted a black hole devouring a star in a distant galaxy. One of the rarest astronomical events, it's believed to happen only about once per 100,000 years per galaxy." That is the ENTIRE written content of the link.

2] It's a video "news" article.

3] It's content-free.

The BH is named Swift-J 1644+57 if anyone wants to read up on it.

clearwater, please, in the future supply an explanation, not just an inscrutable link.
 
Last edited by a moderator:
FYI, a neutron star would induce similar effects on it's scale. They can and do rip matter from other stars and have their own accretion discs. The only thing special about a black hole is that they are more massive and compacted into an area of space small enough so it that causes them to have an event horizon where light cannot escape once inside it.
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
View full post »

Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

Similar threads

B Evolution of the Universe in reverse
Replies
41
Views
3K
B Questions about the Eddington Limit and Super - Eddington black holes
Replies
0
Views
2K
I Why didn't the Big Bang form a Black Hole?
Replies
7
Views
3K
A Black hole mass coupled to expansion -- astrophysical source of dark energy?
3
Replies
134
Views
10K
B Could the source of dark energy be our parent black hole feeding?
Replies
6
Views
2K
I Brian Cox and the end of the Universe?
Replies
13
Views
5K
I Seeking Visualization Tools for Hypothetical Black Hole Concept
Replies
2
Views
2K
A Black Hole TON618 - Wavelength Spectrum
Replies
38
Views
4K
I Black Hole to Other Universe: Violation of 1st Law?
Replies
9
Views
3K
B Question about Hawking Radiation and Iron Stars
Replies
7
Views
3K

Hot Threads

Recent Insights

Back
Top