Is it possible Earth is a black hole?

Click For Summary

Discussion Overview

The discussion explores the hypothetical question of whether Earth could be considered a black hole, particularly in the context of information encoding on its surface. Participants engage with concepts from theoretical physics, including black hole properties and the holographic principle.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant proposes the idea that Earth could be a black hole with data encoded in two dimensions on its surface, seeking proofs for this notion.
  • Another participant argues against this idea, stating that Earth reflects light, which contradicts the nature of black holes that do not allow light to escape.
  • A further response suggests that the appearance of reflection could be part of an encoding mechanism, referencing the holographic principle and black hole thermodynamics.
  • Another participant provides a practical example involving a flashlight and a black hole to illustrate that Earth cannot be a black hole, emphasizing that Earth is too large and not dense enough to meet the criteria for a black hole.
  • One participant asserts that the properties of Earth do not align with those defined by general relativity for black holes, reinforcing the argument against the initial hypothesis.

Areas of Agreement / Disagreement

Participants generally disagree on the initial hypothesis, with multiple views presented regarding the nature of black holes and the properties of Earth. The discussion remains unresolved as no consensus is reached.

Contextual Notes

Participants reference theoretical concepts such as the Schwarzschild Radius and the holographic principle, but there are no detailed calculations or definitions provided in the discussion.

DIGBY STILLS
Messages
2
Reaction score
0
Yes I know. Sounds silly. I'm not a physicist, but it occurred to me to wonder: is it possible Earth is a black hole with data encoded in two dimensions on its surface? What would the proofs look like?

Discuss.
 
Astronomy news on Phys.org
DIGBY STILLS said:
is it possible Earth is a black hole
No. Earth reflects light. Black holes don't, since light can't escape from them. EDIT: See e.g. Measuring Earth's Albedo.
 
DennisN said:
No. Earth reflects light.
And this appearance of reflection couldn't be part of the encoding? I promise I'm not being flippant. Susskind explains that to the person entrapped beyond the threshold of the black hole, all seems fine. Outside the event horizon, all seems lost, but within it, there is no change. At least not initially. Is it possible that from here, we see things as they would normally seem as the information is encoded on the surface? I know. Funny questions.
 
DIGBY STILLS said:
Susskind explains that to the person entrapped beyond the threshold of the black hole, all seems fine.
I know what you are talking about, black hole thermodynamics and the holographic principle. The holographic principle is theoretical physics. But I address your question from a more practical viewpoint:

Let's assume you are on the Moon and you have got a powerful flashlight. Also assume there's a nearby black hole. If you shine that flashlight on the black hole, it will not reflect any light, the light will enter the black hole and not escape. But if you shine the flashlight on Earth, part of the light will be reflected. Thus, the Earth is not a black hole.

Furthermore: The Earth can not be a black hole, it is too big and not heavy enough to be one. See The Schwarzschild Radius (HyperPhysics). EDIT: I haven't made the calculation myself but according to the http://en.wikipedia.org/wiki/Schwarzschild_radius#Parameters Earth's Schwarzschild Radius is about 9mm, that is, if the Earth had a radius of 9 mm it would be a black hole.
 
  • Like
Likes   Reactions: davenn
Thread closed temporarily for Moderation...
 
DennisN has covered pretty much all the ground here: there is no way that the Earth can be a black hole. We know from the equations of general relativity what properties a black hole has, and the Earth doesn't have these properties.

The thread will remain closed, as there's no better answer than has already been provided.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 17 ·
Replies
17
Views
6K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 27 ·
Replies
27
Views
6K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 14 ·
Replies
14
Views
3K