The singularity at the center of a black hole is the ultimate no man’s land: a place where matter is compressed down to an infinitely tiny point, and all conceptions of time and space completely break down. And it doesn’t really exist. Something has to replace the singularity, but we’re not exactly sure what.

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## When first Penrose diagram?

1950s

A Penrose diagram is a kind of spacetime diagram arranged to make clear the complete causal structure of any given geometry. They are an indispensable map for navigating inside a black hole. Roger Penrose, who invented this kind of diagram in the early 1950s, himself calls them conformal diagrams.

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

The singularity at the center of a black hole is the ultimate no man’s land: a place where matter is compressed down to an infinitely tiny point, and all conceptions of time and space completely break down. And it doesn’t really exist. Something has to replace the singularity, but we’re not exactly sure what.

**What is the diameter of a black hole?**

A black hole with the mass of the sun has a diameter of about 6 kilometers, or 4 miles. Want to know the diameter of the black hole at the center of the Milky Way? Based on the motions of stars circling around it, the black hole has a mass of 3.6 million suns.

**Do black holes stretch you?**

Your body stretches out, not uncomfortably at first, but over time, the stretching will become more severe. Astronomers call this spaghettification because the intense gravitational field pulls you into a long, thin piece of spaghetti. When you start feeling pain depends on the size of the black hole.

## How do you make a Penrose diagram?

You can draw a Penrose diagram by constructing compact conformal coordinates meaning outgoing light-like surfaces have slope +1 and incoming light-like surfaces have slope -1 and the domain and range of the diagram are compact meaning that the infinite points in space and time are mapped to finite region.

### Do white holes have gravity?

Its gravity is powerful. Light cannot escape it. Hence, a black hole’s blackness. White holes are the theoretical opposite of black holes.

**How big is Sagittarius A?**

13.67 million miSagittarius A* / Radius

**What would it be like to be Spaghettified?**

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 boringly referred to as spaghettification.

## What is the Penrose diagrams?

PENROSE DIAGRAMS Our goal here is to have a visual representation of an in\fnite spacetime with a \fnite coordinate range, while preserving its causal structure. Penrose diagram of the Minkowski spacetime The Minkowski metric in spherical polar coordinates is ds2= dt2+ dr2+ r2d

### What is the Penrose diagram for the Minkowski spacetime?

This triangular region as portrayed below is the Penrose diagram for the Minkowski spacetime. Figure 2: Penrose diagram for the Minkowski Metric 6 fHere, each point represents a 2-sphere except points at i0 , i± . This can be seen as sin2 χ is 0 at χ = 0, π, which is to say that the radius of the sphere at that point becomes 0.

**What is the Penrose diagram for the extended Schwarzschild metric?**

Penrose diagram for the extended Schwarzschild metric we \fnd tan(T~) = 2T 1 + R2T : (15) Therefore, the singularity r= 0, which corresponds to 1 + R2T2!0+, corresponds to T~ !sign(T)ˇ=2. We show the resulting Penrose diagram in Fig. 3. Light cones are also at 90-degree angles on this diagram.

**What is the Minkowski metric in spherical coordinates?**

Penrose diagram of the Minkowski spacetime The Minkowski metric in spherical polar coordinates is ds2= dt2+ dr2+ r2d 2: (1) We change variables to u r; v+ r; 1 <+1: (2) ds2= dudv+ 1 4 (v u)2d