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بهترین سایت شرط بندی ایرانی
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بهترین سایت شرط بندی ایرانی
بهترین سایت شرط بندی ایرانی

Global Statistics

All countries
695,781,740
Confirmed
Updated on September 26, 2023 9:04 pm
All countries
627,110,498
Recovered
Updated on September 26, 2023 9:04 pm
All countries
6,919,573
Deaths
Updated on September 26, 2023 9:04 pm

Global Statistics

All countries
695,781,740
Confirmed
Updated on September 26, 2023 9:04 pm
All countries
627,110,498
Recovered
Updated on September 26, 2023 9:04 pm
All countries
6,919,573
Deaths
Updated on September 26, 2023 9:04 pm

Biggest ever map of the universe reveals 11 billion years of history

What Does the Word ‘Himbo’ Mean?

THE INTERNET, IN classic fashion, created a new vocab word recently: the “himbo”. The word, which is a portmanteau of “him” and “bimbo,” skyrocketed into modern vernacular following a 2020 Twitter controversy (of course). Since then, folks on social media have been arguing over the word’s meaning and whether or not it’s socially acceptable to

Indian states ban cough syrup linked to child deaths

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Prediabetes remission possible without dropping pounds, new study finds

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Antibody Prevention of RSV in Infants; Medical Imaging and Cancer Risk in Kids

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By Leah Crane

New Scientist Default Image

The Sloan Digital Sky Survey used a 2.5-metre telescope in New Mexico to capture the biggest map of the universe

Sloan Digital Sky Survey

A huge 3D map depicts 11 billion years of cosmic history and places the tightest constraints ever on our best model of the universe. Captured by the Sloan Digital Sky Survey (SDSS), it has bolstered our leading picture of the cosmos, even though it deepens one enduring mystery.

Light travels at a finite speed, so looking into space also means peering back through time. This new survey looks deep enough to map 80 per cent of the universe’s 14-billion-year history. “There isn’t anything else with that range of coverage and that allows us to fill this 11-billion-year gap between the ancient and recent universe,” says Kyle Dawson at the University of Utah, who leads the extended Baryon Oscillation Spectroscopic Survey (eBOSS) team at SDSS.

The team observed galaxies and quasars, which are the bright centres of some galaxies, and used their red shifts – changes in light due to them moving away from us – to measure distances and the rate of and expansion of the universe. This lets us watch giant structures such as galaxy clusters forming.

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“The universe now is very clumpy: there can be large things like galaxies or planets in one place, or nothing in another place,” says Scott Dodelson at Carnegie Mellon University in Pennsylvania. That wasn’t always the case. “It used to be that if you went to one random place and counted 1000 atoms and then went to another random place, you might count 1001 but probably not even 1002.”

Our leading approach to understand how the universe went from mostly homogeneous to clumpy is a model called lambda-CDM. Some past measurements have hinted that what we see in the universe may not match that model’s predictions, but the eBOSS map shows no conflict at all. So lambda-CDM is holding up well.

The development of large-scale structure is partly dependent on the behaviour of particles known as neutrinos in the early universe; eBOSS was able to constrain their mass, which is a big outstanding problem in physics. It didn’t quite nail it down, but the measurement was as precise as the best ground-based neutrino experiments.

The team also constrained the shape of the universe 10 times more tightly than our next best set of observations. As predicted by lambda-CDM, space-time as a whole seems to be flat, not curved.

However, one existing conflict has been exacerbated by the survey. “Things are fitting together remarkably well, with the exception of the Hubble constant,” says Wendy Freedman at the University of Chicago. This is a measure of the rate of expansion of the universe. Our two main ways of calculating it – using the ancient cosmic microwave background (CMB) versus a local measurement of the movement of nearby objects – always disagree.

The eBOSS study agrees with the CMB method, which deepens the puzzle. “There’s probably some missing physics somewhere, but nobody has been able to come up with it yet,” says Freedman.

Reference: arxiv.org/abs/2007.08991

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What Does the Word ‘Himbo’ Mean?

THE INTERNET, IN classic fashion, created a new vocab word recently: the “himbo”. The word, which is a portmanteau of “him” and “bimbo,” skyrocketed into modern vernacular following a 2020 Twitter controversy (of course). Since then, folks on social media have been arguing over the word’s meaning and whether or not it’s socially acceptable to

Indian states ban cough syrup linked to child deaths

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Want Bigger, Stronger Arms? Use the Biceps Cable Curl to Finish Off Your Workouts.

IF YOU’RE LOOKING to blow up your arms, you've got plenty of training tools in your arsenal. You can use hammer curls, preacher curls, and of course, the tried-and-true standing biceps curls. All of these exercises will have you working with free weights (either dumbbells or barbells), which is great—but you’re missing out on some

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What Does the Word ‘Himbo’ Mean?

THE INTERNET, IN classic fashion, created a new vocab word recently: the “himbo”. The word, which is a portmanteau of “him” and “bimbo,” skyrocketed into modern vernacular following a 2020 Twitter controversy (of course). Since then, folks on social media have been arguing over the word’s meaning and whether or not it’s socially acceptable to

Indian states ban cough syrup linked to child deaths

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Want Bigger, Stronger Arms? Use the Biceps Cable Curl to Finish Off Your Workouts.

IF YOU’RE LOOKING to blow up your arms, you've got plenty of training tools in your arsenal. You can use hammer curls, preacher curls, and of course, the tried-and-true standing biceps curls. All of these exercises will have you working with free weights (either dumbbells or barbells), which is great—but you’re missing out on some