Rapid Expansion of the Universe

In summary: No, that's not the way it works. The universe is all there is. It doesn't expand "into" or "against" anything. Drakkith already explained this.If it is the something of the Universe that expands like a balloon expands then the Universe would expand outwards as an expanding force that will create an equal and opposite reaction against other something's in the Universe.
  • #1
Dryson
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I have a "What If." question.

Suppose a black hole located in a universe encounters a rapid expansion of another universe with the universe that is in close approximation to the black hole. Would the rapidly expanding universe destroy the black hole or would the expanding universe actually cause the space time around and within the black hole itself to be warped as the two colossal forms of energy unite?
 
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  • #2
Expansion does not work that way. The universe is not expanding into something. It is the something of the Universe that expands.
 
  • #3
To elaborate on Orodruin's post, our current model of expansion describes the evolution of our own universe from a very dense state to a much lower density state over the last 13.7 billion years due to expansion. Expansion here means 'unbound objects within the universe recede from each other over time'. It does not mean that the universe has a boundary that is moving outward into pre-existing space. By our current understanding, a black hole cannot encounter another expanding universe because that is not what expansion, in the cosmological sense, is talking about.
 
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  • #4
Shouldn't this be in the scifi forum?
 
  • #5
Chronos said:
Shouldn't this be in the scifi forum?
Yep.
 
  • #6
Orodruin said:
It is the something of the Universe that expands.
If something is expanding does it not occupy a larger area of space? If it is the something of the Universe that expands like a balloon expands then the Universe would expand outwards as an expanding force that will create an equal and opposite reaction against other something's in the Universe.

The reason this question is based off of two black holes being theorized about colliding - http://hubblesite.org/explore_astronomy/black_holes/encyc_mod3_q6.html
 
  • #7
Dryson said:
If something is expanding does it not occupy a larger area of space? If it is the something of the Universe that expands like a balloon expands then the Universe would expand outwards as an expanding force that will create an equal and opposite reaction against other something's in the Universe.
No, that's not the way it works. The universe is all there is. It doesn't expand "into" or "against" anything. Drakkith already explained this.
 
  • #8
Dryson said:
If it is the something of the Universe that expands like a balloon expands then the Universe would expand outwards as an expanding force that will create an equal and opposite reaction against other something's in the Universe.

You're thinking of space as something physical that presses up against something else as it expands. This is not correct. Expansion means that the distances between objects within space increases over time. The exact way expansion works is that the recession velocity, which is simply the speed that an object is moving away from us, increases as the distance between us and the object increases. If you double the distance, the recession velocity doubles as well. So if you choose an object at any finite distance from us, there will be a clear velocity that it is moving away at. Expansion will never cause an object to come towards us. In other words, there are no other 'somethings'. Expansion applies to our universe just as I explained.
 

1. What is the "Rapid Expansion of the Universe"?

The rapid expansion of the universe, also known as cosmic inflation, is the theory that the universe underwent a brief period of extremely rapid expansion in the first fractions of a second after the Big Bang.

2. How was the "Rapid Expansion of the Universe" discovered?

The theory of cosmic inflation was first proposed by physicist Alan Guth in the 1980s. It was later confirmed by observations of the cosmic microwave background radiation, which showed patterns consistent with the rapid expansion of the universe.

3. What evidence supports the "Rapid Expansion of the Universe"?

In addition to observations of the cosmic microwave background radiation, other evidence for the rapid expansion of the universe includes the distribution of galaxies, the abundance of light elements, and the large-scale structure of the universe.

4. What is driving the "Rapid Expansion of the Universe"?

The cause of the rapid expansion of the universe is still not fully understood. Some theories suggest that it is driven by a mysterious force called dark energy, while others propose that it is a result of the energy stored in the fabric of space itself.

5. How does the "Rapid Expansion of the Universe" affect our understanding of the universe?

The theory of rapid expansion has greatly influenced our understanding of the universe and the laws of physics. It helps to explain many observed phenomena, such as the uniformity of the universe and the structure of galaxies. It also raises new questions about the nature of dark energy and the ultimate fate of the universe.

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