Wednesday, January 7, 2015

Falling into a black hole: The singularity and spagettification

If you were falling toward a black hole, most of the time you would simply feel weightless. The gravity of a black hole is just like the gravity of any other large mass, as long as you don’t get too close.

Suppose you were falling feet first toward a black hole. As you got closer, your feet would feel a stronger force than your head, for example. These differences in forces are called tidal forces. Because of the tidal forces it would feel as if you are being stretched head to toe, while your sides would feel like they are being pushed inward. Eventually the tidal forces would become so strong that they would rip you apart. This effect of tidal stretching is sometimes referred to as spaghettification.

A friend watching you fall toward a black hole would never see you reach the black hole. As you fall towards it, gravity would cause any light coming from you to be redshifted. So as you approached the black hole you would appear more and more reddish, and your image would appear dimmer and dimmer. Your friend would see you redden and dim as you approach, but never quite reach, the event horizon of the black hole. If they could still see you past this point, there would be additional red from the inside of you clouding up the view.

  • The larger the black hole, the weaker the tidal forces near its event horizon. So if you happened to be near a supermassive black hole, you could cross the event horizon without really noticing.


  1. So black hole is simply we can say a natural time machine which can help us to travel in future as well as in past.
    If take a closer look back hole is simply a place where all the dimension became zero.(0,0,0) so consider a black hole origin point in the XYZ X' plane And X-axis representing TIME(+VE) And X' is representing Time (-ve) And Y-axis representing speed of light(C) if start moving from Origin (Black hole) in XY plane as closer to Y-axis we are moving with the speed of light if we look graph AND if start moving in X'Y plane we are moving with double the speed of light which is nearly 6*10^16m/s we are travelling back to time
    WE can use black hole as time Machine
    Black is the Origin of universe ANd also the End . it is more likely A cyclic process as other in universe

    1. 8 words into your comment I knew you were Indian, and after noticing your name I confirmed my suspicion. You're hardly capable of writing a single coherent sentence, let alone having a beginner's grasp of special relativity. No, you wouldn't travel back in time, for the same reasons why going 99% the speed of light and turning on a flashlight won't make the flashlight's photons travel at 1.99c.