# Audio question about black hole

• I
• Ryan Walsh
In summary, the lightpaths in this image are simply straight lines at a 45-degree angle to the vertical.

#### Ryan Walsh

I was wondering if someone can help explain to me what is happening in the image.
Black holes have Light paths or something

so i read here more accurate description is that within this horizon, all lightlike paths (paths that light could take) and hence all paths in the forward light cones of particles within the horizon, are warped so as to fall farther into the hole

I was wondering in this image if that is what the lightpaths are

this is a Mp3 file of a black hole

Well, if someone uploads video/mp3 like this on youtube, and names it "blackhole", it doesn't mean it has anything to do with a black hole. You can safely ignore both, the audio and the visual part of this video.

Ryan Walsh said:
I was wondering in this image if that is what the lightpaths are
The lightpaths (and the paths of infalling objects) can look like pretty much anything, depending on what coordinates you are using. Thus, the first step has to be to label your coordinate axes: what does it mean to have a line moving upwards in the diagram? What does it mean to have a line moving to the right in the diagram?

If we use Kruskal coordinates, the lightpaths are straight lines at a 45-degree angle to the vertical (and understanding what a Kruskal diagram is showing you is one of the best ways of understanding what's really going on around the event horizon). If we use Schwarzschild coordinates, the path of a flash of light moving towards the black hole from outside starts as (almost) a 45 degree line that bends upwards so that it he's closer and closer to the event horizon but never gets there: the path of a light starting inside the event horizon is always slanted sideways pointing away from the vertical line representing the horizon and towards the vertical line representing the singularity at ##t=0##.

Thanks Nugatory I shall look into that. Although Probably won't understand much. I am still highly curious about so said files

well i got few more videos

also a 3d spectra of it