The current measurements of the expansion rate of the universe are in disagreement, leading to a crisis in cosmology and the need for renewed research efforts into new physics and a new model of the universe
Questions to inspire discussion
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What is the crisis in cosmology?
—The crisis in cosmology refers to the disagreement between measurements of the expansion rate of the universe, leading to the need for renewed research efforts into new physics and a new model of the universe.
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What are the possible explanations for the discrepancy in the expansion rate of the universe?
—The two possible explanations are that there is something wrong with our current model of the universe, leading to new physics and a new model, or there is something wrong with our observations of the local universe.
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How does the Milky Way's location affect the rate of expansion of the universe?
—The Milky Way being in the Laniakea super cluster affects its motion through space, potentially leading to an overestimation of the rate of expansion of the universe.
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What affects the rate of expansion of the universe for galaxies in a cluster?
—The overall motion away from us due to the expansion of space and random motion due to gravity affect the rate of expansion of the universe for galaxies in a cluster.
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What potential observational bias is suggested in the new study?
—The new study suggests potential observational bias affecting measurements of the expansion rate of the universe, prompting further investigation into the crisis in cosmology.
Key Insights
- 📊 The two main ways of measuring the current expansion rate of the universe no longer give us the same answer and completely disagree with each other, creating the Hubble tension.
- 🌌 The study concluded that the values for the expansion rate of the universe should actually be further apart when taking into account the Lan AA super cluster of galaxies.
- 🌌 The peculiar motion of galaxies in a cluster can have a significant impact on our observations, especially when the cluster is closer to us.
- 🌌 The expansion rate of the universe may be wrong due to the peculiar motion of galaxies, leading to incorrect measurements of distance and velocity.
- 🔍 The study found that the measurement of the rate of expansion would increase in value by 0.5 km per second per megaparsec, making the crisis in cosmology worse.
- 🔭 The crisis in cosmology may lead to renewed research efforts into brand new physics and a whole new model of the universe.
#Space #Cosmology
Clips
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00:00 🔍 New study worsens the crisis in cosmology by revealing disagreement between methods of measuring the universe's expansion rate, leading to two possible explanations: either our model of the universe is wrong, or our observations are.
- New research paper on the crisis in cosmology makes the problem worse by showing disagreement between two main methods of measuring the expansion rate of the universe.
- The discrepancy between the expansion rate of the universe predicted by the best fit cosmological model and the rate measured in observations of the nearby universe has led to two possible explanations: either there is something wrong with our current model of the universe, which would lead to new physics and a new model, or there is something wrong with our observations of the local universe.
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02:22 🔭 The study of the Lan AA super cluster of galaxies suggests that the crisis in cosmology is worsened by the discrepancy in the values for the expansion rate of the universe.
- The study of the Lan AA super cluster of galaxies concluded that the values for the expansion rate of the universe should be further apart, making the crisis in cosmology worse.
- The rate of expansion of the universe may be overestimated due to the Milky Way being in the Lania super cluster, which affects its motion through space.
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03:59 🔭 Galaxies in a cluster have both overall and random motion, with a new study modeling Lanaya's shape and peculiar motions to calculate the expansion rate of the universe.
- Galaxies in a cluster have both an overall motion away from us due to the expansion of space and random motion due to gravity, with the latter becoming more significant for closer clusters like the Milky Way and lania.
- Giani and collaborators modeled the shape of Lanaya as an ellipsoid, then modeled the peculiar motions of galaxies within the cluster to calculate the expansion rate of the universe.
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06:05 🌌 The velocities of galaxies affect the rate of expansion and distance measurements in cosmology.
- Galaxies appear to be moving away from us due to the expansion of the universe, but if the velocities we measure are wrong, it affects the rate of expansion and the distance to other galaxies.
- Galaxy members are found across the entire sky, affecting distance measurements if not taken into account.
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07:42 🌌 The peculiar motions of galaxies in the super cluster are affecting the rate of expansion of the universe, leading to a 0.5 km/s/Mpc increase in the expansion rate, worsening the crisis in cosmology.
- Galaxies in the super cluster have peculiar motions affecting the rate of expansion of the universe, leading to a 0.5 km per second per megaparsec increase in the value of the expansion rate, worsening the crisis in cosmology.
- The shape of the Lanaka super cluster is oversimplified and there could be a void beyond it, affecting the expansion rate of the universe.
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10:18 🔭 New study suggests observational bias affecting measurements of the universe's expansion rate, prompting further investigation and potential new research into a whole new model of the universe.
- New study suggests potential observational bias affecting measurements of the expansion rate of the universe, prompting further investigation.
- New study may reveal whether local observations of the universe are causing a crisis in cosmology, leading to potential new research efforts into brand new physics and a whole new model of the universe.
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12:32 🔍 Interactive learning is six times more effective than passive learning, making it one of the best ways to learn science, math, data science, and computer science.
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13:10 🔭 New study worsens crisis in cosmology.
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