Somewhere beyond the reach of any human sense, our Sun drifts through the Milky Way at a speed that most of us would find dizzying, and a new study suggests that our passage through the wider cosmos may be stranger than we had supposed. Researchers reading the faint pattern of distant radio galaxies, sifted through the eyes of a European radio array and two sister observatories, report a motion more than three times faster than the standard cosmological picture allows. The finding, published in Physical Review Letters, does not yet overturn the account of how the universe has unfolded since th
Our Solar System May Be Moving Over Three Times Faster Than Cosmic Models Predict
A faint headwind, and a speed more than three times what models allow
Mark
So what did they actually measure?
Mimi
A headwind. Because we're moving, more radio galaxies show up ahead of us than behind. They used LOFAR across Europe plus two other radio observatories to measure that imbalance.
Mark
And the imbalance was bigger than expected?
Mimi
The distribution came out 3.7 times stronger than the standard model predicts, which translates to a speed more than three times what models suggest.
Luke
Worth being careful there. The 3.7 figure is about the strength of the signal. The speed claim is an inference from it, and the source doesn't give error bars or say how many sigma this is.
Mark
Why does the statistical method matter?
Mimi
Many radio galaxies have multiple components, so naive counting can mislead. The team built a method to handle that and says it gives a more accurate analysis.
Luke
Though a new method also means other groups haven't yet had a chance to stress-test it.
Mark
What does Schwarz say it means?
Mimi
Two options. Either our assumptions about the universe's large-scale structure need questioning, or radio galaxies are less uniformly distributed than we believed.
Luke
And that second option matters. It means the result might not overturn cosmology at all, just our assumption about the sample. The reporting doesn't say which is more likely.
Mark
So what's known?
Luke
That the measurement disagrees with the model. Why remains open.
Il Polso
- A faint cosmic headwind, detected through radio galaxies, suggests the solar system is racing through space far faster than models allow.
- The measured signal came out 3.7 times stronger than the standard model predicts, jolting assumptions that cosmologists have leaned on for decades.
- Researchers used LOFAR and two other radio observatories, and introduced a new statistical method to account for multi-component galaxies.
- The result has split the field into two possibilities: a flawed picture of large-scale structure, or radio galaxies that are less uniform than believed.
- Further measurements are now the only way to tell which explanation holds, leaving the standard model under direct test.
Somewhere beyond the reach of any human sense, our Sun drifts through the Milky Way at a speed that most of us would find dizzying, and a new study suggests that our passage through the wider cosmos may be stranger than we had supposed. Researchers reading the faint pattern of distant radio galaxies, sifted through the eyes of a European radio array and two sister observatories, report a motion more than three times faster than the standard cosmological picture allows. The finding, published in Physical Review Letters, does not yet overturn the account of how the universe has unfolded since the Big Bang, but it asks whether our assumptions about its vast architecture, or about the evenness of the lights we use to measure it, deserve a second look.
The Sun is carrying us around the center of the Milky Way at roughly 450,000 miles per hour, completing one lap about every 230 million years. None of that motion is felt on the ground, but astronomers have learned to read it in the way light from distant galaxies shifts and in the way those galaxies crowd across the sky.
A new study now argues that our motion through the wider cosmos may be far faster than the standard picture allows. A team detected what they describe as a faint headwind produced by our travel, and concluded that the Sun and its planetary neighbors are moving more than three times faster than current models predict. The work, published in Physical Review Letters, touches the heart of cosmology and the story of how the universe has evolved since the Big Bang.
The researchers turned to radio galaxies, bright sources of long-wavelength radio emission, and mapped their distribution with LOFAR, the Low Frequency Array spread across Europe, alongside data from two other radio observatories. The logic is simple in outline: more galaxies appear ahead of our motion than behind it, and the size of that imbalance reveals our speed. A new statistical method, built to handle galaxies made of several components, sharpened the count.
When everything was combined, the distribution came out 3.7 times stronger than the standard model expects. Dominik Schwarz, a cosmologist at Bielefeld University and co-author, cautioned that if the speed holds, basic assumptions about the universe's large-scale structure must be questioned. He also raised another possibility: that radio galaxies are simply less evenly spread than believed.
For now the question is open. Either the cosmic framework or the uniformity of these radio sources needs revising, and only further measurements will reveal which.
The Sun is moving at roughly 450,000 miles per hour, or 720,000 kilometers per hour, as it carries the planets around the center of the Milky Way. According to NASA, one full lap takes about 230 million years. None of this is felt on the ground, but astronomers have ways of measuring it, chiefly by mapping the galaxies around us and watching how light from distant objects is shifted.
A new study now suggests the solar system's motion through the wider cosmos may be far faster than the standard picture allows. A team of researchers used very sensitive instruments to detect a faint headwind created by our movement. Their conclusion: the Sun and its neighboring planets are moving more than three times faster than current models predict. The work appeared in Physical Review Letters, and it bears directly on the standard model of cosmology and on how the universe has evolved since the Big Bang.
To get at the speed, the scientists turned to radio galaxies. These objects are bright sources of long-wavelength radio waves, emitting as much as one trillion solar luminosities of radiation. The team studied how radio galaxies are distributed across the sky using LOFAR, the Low Frequency Array, a radio telescope network that spans Europe. They combined its observations with data from two additional radio observatories.
The logic rests on the headwind. As the solar system travels, more radio galaxies appear in the direction of motion than in the opposite direction. Measuring how pronounced that imbalance is gives a handle on how fast we are going.
The researchers also introduced a new statistical method. Many radio galaxies are made up of multiple components, which can complicate counting, and the method accounts for that, yielding a more accurate analysis of the solar system's speed.
When the data were combined, the distribution of radio galaxies came out 3.7 times stronger than the standard model predicts. That gap is what drives the headline claim.
Dominik Schwarz, a cosmologist at Bielefeld University and a co-author, said in a statement that if the solar system really is moving this fast, fundamental assumptions about the large-scale structure of the universe would need to be questioned. He offered an alternative: the distribution of radio galaxies itself may be less uniform than has been believed. In either case, he said, current models are being put to the test.
So the result leaves two readings on the table. Either the universe's large-scale structure is not what the standard model assumes, or radio galaxies are spread less evenly than thought, which would change how the headwind should be read. Which explanation holds is not settled, and further measurements will be needed to test them.
Citazioni salienti
If our solar system is indeed moving this fast, we need to question fundamental assumptions about the large-scale structure of the universe.— Dominik Schwarz, cosmologist at Bielefeld University and study co-author
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