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hobobobo
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I was wondering how can the redshift tell you the size of the universe when there is a cosmological horizon where scientist can't see since light hasn't traveled here yet.
yenchin said:By "universe", most of the time we actually mean the "observable universe".
hobobobo said:I was wondering how can the redshift tell you the size of the universe when there is a cosmological horizon where scientist can't see since light hasn't traveled here yet.
yenchin said:Marcus: By "we" I simply mean in the popular treatment of the subject where often the use of universe and observable universe is not explicitly spelled out and requires the readers to judge which is which. I believe the OP was confused by such a vague statement from the popular treatment, ...
The size of the universe is constantly changing and expanding. Currently, the observable universe is estimated to be about 93 billion light years in diameter.
Scientists use various methods to measure the size of the universe, such as observing the cosmic microwave background radiation, studying the redshift of distant galaxies, and using mathematical models based on the expansion of the universe.
It is currently believed that the universe has no edge or boundary. The universe is thought to be infinite and expanding in all directions.
Since the universe is constantly expanding, it is not possible to reach the edge of the universe. Even if we were to travel at the speed of light, it would take an infinite amount of time to reach the edge.
The size of the observable universe is constantly changing and expanding due to the expansion of space. However, the overall size of the entire universe is still unknown and may be infinite.