The Schwarzschild radius is the radius of the event horizon surrounding a non-rotating black hole.

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## What is the Schwarzschild radius the radius of?

The Schwarzschild radius is the radius of the event horizon surrounding a non-rotating black hole.

## How do you calculate Schwarzschild radius?

The Schwarzschild radius (Rg) of an object of mass M is given by the following formula, in which G is the universal gravitational constant and c is the speed of light: Rg = 2GM/c2.

**What is the Schwarzschild radius of a black hole that is 4 solar masses?**

The supermassive black hole at the centre of our galaxy, called Sagittarius A*, has a mass of about 4 million solar masses. That makes its Schwarzschild radius about 13 million kilometres. By comparison, the radius of the Earth’s orbit is about 150 million kilometres.

**What is the meaning of the Schwarzschild radius?**

Definition of Schwarzschild radius : the radius of the spherical boundary within which a given mass (as of a star) must collapse to become a black hole also : the distance of the event horizon from the center of a black hole.

### What is the Schwarzschild radius of a 3 solar mass star?

For 3 solar masses this radius is 13.5 km, 3/2 x the event horizon radius. The event horizon radius is also called the Schwarzschild radius.

### What is the radius of a black hole?

The radius of a black hole is related to its mass by the simple formula R = 3 M ,where M is the mass of the black hole in units of the sun’s mass, and R is the radius of the Event Horizon in kilometers.

**What is the formula of black hole?**

R S ( M ) = 2 G M c 2 , where G is the gravitational constant and c is the speed of light. It is okay if you do not follow the details of the equation; the basic point is that if you put an amount of mass M or larger in a sphere of radius smaller than RS(M), then voila—it will become a black hole.

**What is the Schwarzschild radius of a 15 solar mass black hole?**

Parameters

Object | Mass | Schwarzschild radius |
---|---|---|

Observable universe | 8.8×1052 kg | 1.3×1026 m (13.7 billion ly) |

Milky Way | 1.6×1042 kg | 2.4×1015 m (0.25 ly) |

Ton 618 (largest known black hole) | 1.3×1041 kg | 1.9×1014 m (~1300 AU) |

SMBH in NGC 4889 | 4.2×1040 kg | 6.2×1013 m (~410 AU) |

## What size is a 1 solar mass black hole?

about 2 x 10^30 kilograms

The mass of a black hole is usually expressed in something called a “solar mass.” One solar mass is defined as the mass of our Sun. This is a very large number, about 2 x 10^30 kilograms. That’s 2 with 30 zeroes after it, or written out: 2,000,000,000,000,000,000,000,000,000,000.

## What is the Schwarzschild radius for a 10 solar mass star?

30 km

The Schwarzschild radius is very small – for an object of a Solar mass it is 3 km and it scales linearly with mass (so a 10 Solar mass object has a Schwarzschild radius of 30 km etc).

**How big is M87 black hole?**

24 billion miles

In 2017 the Event Horizon Telescope obtained an image of the supermassive black hole at the centre of the M87 galaxy. That black hole has a mass equal to six and a half billion Suns but is only 38 billion km (24 billion miles) across.

**Is there a ultramassive black hole?**

Ton 618, the largest ultramassive black hole, appears at the very end of the video, which, at 66 billion times the mass of the Sun, is going to weigh very heavily on how we daydream about the cosmos moving forward.

### How big is Milky Way black hole?

Today, the Milky Way galaxy possesses a supermassive black hole of 4.3 million solar masses. While this might seem tremendous, it’s unusually small for a galaxy as massive as our own.

### How big is TON 618 now?

TON 618 is as bright as 140 trillion suns and has a mass of about 66 billion suns. For comparison, all the stars in our galaxy combined share a mass of only 64 billion suns.