|the rest mass will be the same even we increase in velocity.|
|1. Is Gravity Relative? Like Time & space.|
2. Does Earth become a black hole or not?
3. What happens to matter that is sucked in? Where does it go?
4. Why are people on earth not experiencing the gravity of an black hole?
|Besides its not really important because I'm talking about what happens when it reaches that stage but if you want to know its fine.|
|Why not because as it starts becoming smaller and smaller due to relativistic "shrinking" the observer will think it should become a black hole as the mass is being compressed in smaller and smaller amount of space.|
|Given the structure of the experiment, it may or may not be possible to actually perform it|
|But we will still be increasing in speed regardless of time of movement to take place but the relativistic "compression" begin also happens relative to that therefore time is really not a option here unless travelling at light speed which will breach laws of physics as we know it as earth has mass.|
|Hawking radiation for example requires a black hole for his theory to be proven yet there hasn't because currently its cannot be performed due to legal and other safety issues but its widely excepted.|
|maybe at 99.9999999999999999999999. followed by 100, 99s would it start to increase in gravity or what would happen will it still not be a blackhole?|
|Similarly, it may not be able to be performed now but it does not mean its a bad thought experiment.|
|You cant emit something with zero rest mass like light to reduce earths mass|
|First it is not correct to think of it as compression.|
|What do you think the effects of time dilation will be and how do they factor into the scenario?|
|waaaaaay off the energy to create|
Main article: Event horizon
Far away from the black hole, a particle can move in any direction, as illustrated by the set of arrows. It is only restricted by the speed of light.
Closer to the black hole, spacetime starts to deform. There are more paths going towards the black hole than paths moving away.[Note 1]
Inside of the event horizon, all paths bring the particle closer to the center of the black hole. It is no longer possible for the particle to escape.
The defining feature of a black hole is the appearance of an event horizon—a boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole. Nothing, not even light, can escape from inside the event horizon. The event horizon is referred to as such because if an event occurs within the boundary, information from that event cannot reach an outside observer, making it impossible to determine if such an event occurred.
As predicted by general relativity, the presence of a mass deforms spacetime in such a way that the paths taken by particles bend towards the mass. At the event horizon of a black hole, this deformation becomes so strong that there are no paths that lead away from the black hole.
To a distant observer, clocks near a black hole appear to tick more slowly than those further away from the black hole. Due to this effect, known as gravitational time dilation, an object falling into a black hole appears to slow down as it approaches the event horizon, taking an infinite time to reach it. At the same time, all processes on this object slow down, for a fixed outside observer, causing emitted light to appear redder and dimmer, an effect known as gravitational redshift. Eventually, at a point just before it reaches the event horizon, the falling object becomes so dim that it can no longer be seen.
On the other hand, an indestructible observer falling into a black hole does not notice any of these effects as he crosses the event horizon. According to his own clock, which appears to him to tick normally, he crosses the event horizon after a finite time without noting any singular behaviour. In particular, he is unable to determine exactly when he crosses it, as it is impossible to determine the location of the event horizon from local observations.
The shape of the event horizon of a black hole is always approximately spherical.[Note 2] For non-rotating (static) black holes the geometry is precisely spherical, while for rotating black holes the sphere is somewhat oblate.