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The darkish vitality pushing our universe aside is probably not what it appears, scientists say

November 24, 2024
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The darkish vitality pushing our universe aside is probably not what it appears, scientists say
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The dark energy pushing our universe apart may not be what it seems, scientists say
This Dec. 14, 2023 picture made obtainable by NOIRLab exhibits meteors from the Geminid meteor bathe streaking throughout the sky above the Nicholas U. Mayall Telescope at Kitt Peak Nationwide Observatory (KPNO), a Program of NSF’s NOIRLab, in Tucson, Ariz. Credit score: NSF’s NOIRLab through AP

Distant, historic galaxies are giving scientists extra hints {that a} mysterious power known as darkish vitality is probably not what they thought.

Astronomers know that the universe is being pushed aside at an accelerating price they usually have puzzled for many years over what might probably be rushing all the things up. They theorize {that a} highly effective, fixed power is at play, one that matches properly with the primary mathematical mannequin that describes how the universe behaves. However they cannot see it and they do not know the place it comes from, in order that they name it darkish vitality.

It’s so huge it’s thought to make up nearly 70% of the universe—whereas extraordinary matter like all the celebrities and planets and folks make up simply 5%.

However findings published earlier this year by a world analysis collaboration of greater than 900 scientists from across the globe yielded a serious shock. Because the scientists analyzed how galaxies transfer they discovered that the power pushing or pulling them round didn’t appear to be fixed. And the identical group revealed a brand new, broader set of analyses Tuesday that yielded an identical reply.

“I didn’t assume that such a end result would occur in my lifetime,” stated Mustapha Ishak-Boushaki, a cosmologist on the College of Texas at Dallas who’s a part of the collaboration.






On this 360-degree video, take an interactive flight by way of hundreds of thousands of galaxies mapped utilizing coordinate knowledge from DESI. Credit score: Fiske Planetarium, CU Boulder and DESI collaboration

What’s the DESI collaboration?

Referred to as the Darkish Vitality Spectroscopic Instrument, it makes use of a telescope southwest of Tucson, Arizona to create a three-dimensional map of the universe over 11 billion years to see how galaxies have clustered all through time and throughout house. That offers scientists details about how the universe advanced, and the place it is perhaps heading.

The map they’re constructing wouldn’t make sense if darkish vitality had been a continuing power, as it’s theorized. As a substitute, the vitality seems to be altering or weakening over time. If that’s certainly the case, it might upend astronomers’ customary cosmological mannequin. It might imply that darkish vitality may be very completely different than what scientists thought—or that there could also be one thing else altogether occurring.

“It is a time of nice pleasure, and likewise some head-scratching and confusion,” stated Bhuvnesh Jain, a cosmologist on the College of Pennsylvania who just isn’t concerned with the analysis.

The collaboration’s newest discovering factors to a doable clarification from an older idea: that throughout billions of years of cosmic historical past, the universe expanded and galaxies clustered as Einstein’s basic relativity predicted.

The dark energy pushing our universe apart may not be what it seems, scientists say
The Darkish Vitality Spectroscopic Instrument (DESI) making observations within the night time sky on the Nicholas U. Mayall 4-meter Telescope at Kitt Peak Nationwide Observatory in Tucson, Ariz. Credit score: Peter Toman Tomas Slovinsky/NSF’s NOIRLab through AP

Is darkish vitality useless?

The brand new findings aren’t definitive. Astronomers say they want extra knowledge to overturn a idea that appeared to suit collectively so effectively. They hope observations from different telescopes and new analyses of the brand new knowledge over the subsequent few years will decide whether or not the present view of darkish vitality stands or falls.

“The importance of this end result proper now’s tantalizing,” stated Robert Caldwell, a physicist at Dartmouth School who just isn’t concerned with the analysis, “however it’s not like a gold-plated measurement.”

Why does darkish vitality matter?

There’s quite a bit driving on the reply. As a result of darkish vitality is the largest element of the universe, its habits determines the universe’s destiny, defined David Spergel, an astrophysicist and president of the Simons Basis. If darkish vitality is fixed, the universe will proceed to develop, perpetually getting colder and emptier. If it is rising in power, the universe will develop so speedily that it will destroy itself in what astronomers name the Huge Rip.

“To not panic. If that is what is going on on, it will not occur for billions of years,” he stated. “However we might prefer to find out about it.”

© 2024 The Related Press. All rights reserved. This materials is probably not revealed, broadcast, rewritten or redistributed with out permission.

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