How will astronomers know when the universe stops expanding?
They don't know.
The expansion of the universe is regulated by gravity and something that we do not know and we call Dark Energy. The DA is accelerating the expansion of the universe and, until we do not understand what DE is, we will not be able to make predictions about the fate of the expansion. It can expand forever or stop, at a certain moment. Right now nobody knows.
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When the rate of the expansion of the universe slows down
The theory that matter and energy were eternal and would recycle between Big Bangs and Crushes required that the rate of expansion should slow down and eventually reverse; the supernova studies of 1997 and 1998 were conducted to confirm this theory.
The implications are that the universe will never stop expanding, that it is an open system, and that matter and energy are not eternal or self-existent. The studies showed that the rate of expansion of the universe is actually increasing rather than decreasing as predicted.
Astronomers would be able to determine whether the universe is stopping its expansion by examining the rates at which it is stopping. Based on these studies, it appears that the universe will continue to expand.
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The rate at which the universe expands will be observed over time, and if it slows down and eventually stops, astronomers will be able to determine when the universe has reached its maximum size. This can be done by measuring the distances and velocities between galaxies and by examining the effects of dark energy, dark matter, and other cosmological parameters.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
- How can we determine if the universe is expanding?
- What is the diameter of the universe?
- What is the unit of distanced used to describe the distance between stars?
- Is the word "universe" supposed to be capitalized as a proper noun?
- What is Earth's maximum velocity away from the centre of the universe, when our orbit around the sun, the sun's orbit around the galaxy and the movement of the galaxy itself are all in alignment?

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