November 7, This information helps astronomers determine the age of the universe. ESA and the Planck Collaboration.
First and foremost, I should clear something up: All we really know is that something happened However, if we look at the expanding universe, we can extrapolate that, General relativity suggests that the Universe would be packed into a singularity.
The idea the article brings up is this: However, hypervelocity stars will likely be detected outside of the Milky Way or rather, Milkomeda. The 4-page paper the article is based on, Loebactually makes this clear in a graph: This will really become noticeable once they are about 2.
Of course, these stars will not be easily found, but Loeb mentions that future astronomers will likely have advanced their tools and instruments by that time. After this, we just need to measure the necessary parameters, and finally we can calculate the age of the Universe using the Friedmann equation: The hypervelocity stars will be the only extragalactic objects detectable by then, and thus we will rely on them to confirm our measurements.
Interestingly, Loeb mentions that observing and analyzing the expansion of the Universe at that time would answer some of the uncertainties we have today: The working assumption so far was that the vacuum energy density remains constant and does not decay to a lower energy state over hundreds of e-folding times.
Measuring the dynamics of hypervelocity stars at late cosmic times provides the added benefit of testing whether the cosmological constant is truely [sic] constant.
Indications to the contrary might reveal new physics, such as that considered by evolving dark energy models. Thus, even though much of the Universe will not be observable by that time, we will ironically have more answers about cosmology than we do today, simply by observing the few extragalactic objects that will be visible.
This is the general explanation of how we can find the time since the Big Bang. All we know is something happened Using hypervelocity stars, future humans would be able to determine the time since the Big Bang as well.Astronomers Construct Hypothesis to Determine Origins of the Universe PAGES 2.
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We invite you to come along on a series of voyages to explore the universe as astronomers understand it today. Beyond Earth are vast and magnificent realms full . How can we use hypervelocity stars to determine the origins of the Universe? I guess my thought here is that astronomers have modeled this scenario and found that if we were to find a hypervelocity star, we could then use the scenario above to calculate the age.
How can we use hypervelocity stars to determine the origins of the Universe. Why can't we determine the center of the universe [duplicate] up vote 1 down vote favorite. This question already has an answer here: How can we use hypervelocity stars to determine the origins of the Universe?
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