As the Universe expands, this characteristic distance expands as well, allowing us to measure the Hubble constant, the dark matter density, and even the scalar spectral index. finding a galaxy at a certain distance from any other galaxy is governed by the relationship between dark matter and normal matter.
This imprint has a name: baryon acoustic oscillations, because it’s the normal matter (baryons) imprinting pressure waves (acoustic oscillations) on the large-scale structure of the Universe.Īn illustration of clustering patterns due to Baryon Acoustic Oscillations, where the likelihood of. It means that, today, if you drew a smooth curve that represented how likely you’d be to find another galaxy, the wave feature means that you’re actually more likely to find a galaxy that’s 500 million light-years away than you’d anticipate, but less likely to find one 400 million or 600 million light-years away. until you run into that “wave” feature imprinted in the very early Universe.as you move farther away, you’re (gradually) less likely to find another galaxy,.you’re likely to find a galaxy close to your own, because gravity is attractive,.You can imagine starting at a galaxy and setting down an invisible “ruler” to measure the distance between that galaxy and every other galaxy you can find. In our nearby Universe, for example, which has been expanding for 13.8 billion years since the Big Bang, we’ve measured how galaxies cluster together.
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