Event Horizons and Star's mass relationship

Thread starter PhyHunter
Start date Mar 29, 2013
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Mass Relationship

In summary, an event horizon is the point of no return around a black hole where nothing, including light, can escape due to the extreme gravitational pull. The mass of a star directly affects the size of its event horizon, with more massive stars having larger event horizons. Once a star becomes a black hole, its event horizon cannot change as it is determined by its mass at that time. The relationship between a star's mass and its event horizon's size can be calculated using the Schwarzschild radius formula. Event horizons have a significant impact on the behavior of light around a star, with light crossing the event horizon never being able to escape and the extreme gravitational pull causing light to be bent and distorted.

Mar 29, 2013

PhyHunter

Star Mass how can affect of event horizon. Because I think singularity affects event horizon not mass.

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Mar 29, 2013

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The event horizon of a black hole is determined by the total mass in the black hole only. It does not matter how it is distributed, but GR predicts that all mass concentrates in something like a singularity.

1. What is an event horizon?

An event horizon is the point of no return around a black hole, where the gravitational pull is so strong that nothing, including light, can escape.

2. How does the mass of a star affect its event horizon?

The mass of a star directly affects the size of its event horizon. The more massive the star, the larger its event horizon will be.

3. Can a star's mass change its event horizon after it becomes a black hole?

No, a star's event horizon is determined by its mass at the time it becomes a black hole. Once it has crossed the event horizon and collapsed into a singularity, its mass cannot change.

4. What is the relationship between the mass of a star and its event horizon's size?

The relationship between a star's mass and its event horizon's size can be calculated using the Schwarzschild radius formula. The event horizon's size is directly proportional to the star's mass.

5. How do event horizons affect the behavior of light around a star?

Event horizons have a significant impact on the behavior of light around a star. Once light crosses the event horizon, it can never escape, causing the area around the black hole to appear completely dark. Additionally, the extreme gravitational pull of the event horizon can cause light to be bent and distorted, creating optical illusions and warping the appearance of objects behind it.