<p>As everyone is saying, this is a very loose "plain English" version of some complex ideas, but if space was infinite, you could view this suggestion (that the overall total energy of the universe is zero) as applying to any sufficiently large region of space. So if you pick any 10 billion lightyear diameter sphere you would expect to find the energy of the matter in that sphere more or less cancelled out by the gravitational potential energy arising from the separation of that matter.</p>

CC BY-SA 4.0
2019-06-18T13:32:32.480Z
2019-06-18T13:32:32.480Z
Steve Linton
<p>In his book "Brief Answers to the Big Questions" completed by his colleagues after his death, Stephen Hawking does sort of mention that the negative energy created (along with equal amount of positive) at the time of Big Bang is in space now or is space as both matter-energy and space were created after the Bang. The universe is the ultimate free lunch. As galaxies are moving faster the farther they are, more space is being generated at the same time absorbing the increased magnitude of negative (gravitational  potential) energy. The total sum remaining always zero. It is has no implication about whether the space is finite or not. What it does imply is linkage between motion (all mass-energy is the energy of motion of quarks, gluons, or change in motion due to Higgs field) and gravity, given by Newton's two laws: the law of motion and gravitation. </p>

CC BY-SA 4.0
2020-04-18T10:10:20.127Z
2020-04-18T10:10:20.127Z
Natthi Sharma
<p>I was reading a book by Stephen Hawking, it was written that universe is made up of 2 ingredients,i.e., space and energy and space was the negative energy, so they add up to 0. But since space is energy does that mean it is finite?</p>

CC BY-SA 4.0
2019-06-14T18:09:25.363Z
Just don't take that simple "equation" too literal
Hagen von Eitzen
CC BY-SA 4.0
2019-06-14T18:10:37.277Z
I thought so, but still how can i know how it  works? Thanks
raptorAcrylyc
CC BY-SA 4.0
2019-06-16T01:23:12.887Z
Is the universe finite? We can have models about whether its shape (closed, flat or open) suggests it's finite or infinite, but there's no way we can ever be sure, since we can only see a portion of it. NB Hawking was great at writing books in simple language to explain the complex physics (i.e. mathematics) of things like black holes, but his examples break down if you examine them too closely. :-)
Chappo Hasn't Forgotten
CC BY-SA 4.0
2019-06-17T12:47:07.320Z
Never understood a single book of SH. I must say my copies were translated, I think is important when it comes to already stretched analogies and examples.
Alchimista
<astrophysics><big-bang-theory><general-relativity><singularity>
If space is negative energy and matter is positive energy then does that mean the universe is finite?
raptorAcrylyc
# If space is negative energy and matter is positive energy then does that mean the universe is finite?

(Asked by: username_0 on 2019-06-14)

I was reading a book by Stephen Hawking, it was written that universe is made up of 2 ingredients,i.e., space and energy and space was the negative energy, so they add up to 0. But since space is energy does that mean it is finite?

**Tags:** astrophysics, big-bang-theory, general-relativity, singularity

> **Comments:**
> **username_1**: Just don't take that simple "equation" too literal  
> **username_0**: I thought so, but still how can i know how it  works? Thanks  
> **username_2**: Is the universe finite? We can have models about whether its shape (closed, flat or open) suggests it's finite or infinite, but there's no way we can ever be sure, since we can only see a portion of it. NB Hawking was great at writing books in simple language to explain the complex physics (i.e. mathematics) of things like black holes, but his examples break down if you examine them too closely. :-)  
> **username_3**: Never understood a single book of SH. I must say my copies were translated, I think is important when it comes to already stretched analogies and examples.  

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## 2 answers

### Answer by username_4 on 2019-06-18. Score: 3

As everyone is saying, this is a very loose "plain English" version of some complex ideas, but if space was infinite, you could view this suggestion (that the overall total energy of the universe is zero) as applying to any sufficiently large region of space. So if you pick any 10 billion lightyear diameter sphere you would expect to find the energy of the matter in that sphere more or less cancelled out by the gravitational potential energy arising from the separation of that matter.


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### Answer by username_5 on 2020-04-18. Score: 2

In his book "Brief Answers to the Big Questions" completed by his colleagues after his death, Stephen Hawking does sort of mention that the negative energy created (along with equal amount of positive) at the time of Big Bang is in space now or is space as both matter-energy and space were created after the Bang. The universe is the ultimate free lunch. As galaxies are moving faster the farther they are, more space is being generated at the same time absorbing the increased magnitude of negative (gravitational potential) energy. The total sum remaining always zero. It is has no implication about whether the space is finite or not. What it does imply is linkage between motion (all mass-energy is the energy of motion of quarks, gluons, or change in motion due to Higgs field) and gravity, given by Newton's two laws: the law of motion and gravitation.


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