---

備註請放最後面 違者新聞文章刪除

1.媒體來源:
CNN Science

2.記者署名:
Ashley Strickland, CNN


3.完整新聞標題:
‘Another mind-blowing change’: New data suggests mysterious dark energy is
evolving


4.完整新聞內文:
Updated 10:06 AM EDT, Wed April 2, 2025

New hints from one of the most extensive surveys of the cosmos to date suggest
 that mysterious dark energy may be evolving in ways that could shift how
astronomers understand the universe.

Dark energy is a term scientists use to describe an energy or force that
accelerates the expansion of the universe. But — although it represents 70%
of the energy in the cosmos — researchers still have no idea exactly what
dark energy is, said Mustapha Ishak-Boushaki, professor of physics and
astrophysics at the University of Texas at Dallas.

Ishak-Boushaki is a cochair of a working group for the Dark Energy
Spectroscopic Instrumentcollaboration, known as DESI. The instrument, now in
 its fourth year of surveying the sky, can observe light from 5,000 galaxies
at the same time. When the project concludes next year, it will have measured
the light of about 50 million galaxies.

The collaboration, which includes more than 900 researchers, shared the latest
 data release from DESI’s first three years of observations on March 19.
Among its findings are the measurements of nearly 15 million galaxies and
quasars, some of the brightest objects in the universe. Ishak-Boushak helped
lead the analysis of the latest DESI data release, which suggests that dark
energy — long called a “cosmological constant” given that astronomers
thought it was unchanging — is behaving in unexpected ways and may even be
weakening over time.

“The discovery of dark energy, nearly 30 years ago, was already the biggest
surprise of my scientific lifetime,” saidDavid Weinberg,a professor of
astronomy at The Ohio State Universitywho contributed to the DESI analysis,
in a statement. “These new measurements offer the strongest evidence so far
that dark energy evolves, which would be another mind-blowing change to our
understanding of how the universe works.”

The findings bring astronomers another step closer to unmasking the mysterious
 nature of dark energy, which may mean that the standard model of how the
universe works could also require an update, scientists say.

A deep look at the universe
The Dark Energy Spectroscopic Instrumentis atop the National Science
Foundation’s Nicholas U. Mayall 4-meter Telescope at Kitt Peak National
Observatory in Tucson, Arizona. The instrument’s 5,000 fiber-optic “eyes”
and extensive surveying capabilities are enabling scientists to build one of
the largest 3D maps of the universe and track how dark energy has influenced
and shaped the cosmos over the past 11 billion years.

It takes time for the light from celestial objects like galaxies to travel to
Earth, which means that DESI can effectively see what the cosmos was like at
different points in time, from billions of years ago to the present.

“DESI is unlike any other machine in terms of its ability to observe
independent objects simultaneously,” said John Moustakas, a professor of
physics at Siena College and colead of the data release.

The newest findings include data on more than double the cosmic objects that
were surveyed and presented less than a year ago. Those 2024 revelations first
 hinted at how dark energy may be evolving.

“We’re in the business of letting the universe tell us how it works, and
maybe the universe is telling us it’s more complicated than we thought it was
,” said Andrei Cuceu, a postdoctoral researcher at the US Department of
Energy’s Lawrence Berkeley National Laboratory, which manages DESI,and
cochair of DESI’s Lyman-alpha working group, in a statement. “It’s
interesting and gives us more confidence to see that many different lines of
evidence are pointing in the same direction.”

Mounting cosmic evidence
DESI can measure what scientists call the baryon acoustic oscillation, or BAO,
 scale — essentially how events that occurred early in the universe left
behind patterns in how matter is distributed across the cosmos. Astronomers
look to the BAO scale, with separations of matter by about 480 million light-
years, as a standard ruler.

“This separation scale is like a really gigantic ruler in space that we can
use to measure distances, and we use the combination of these distance and
redshifts (speed objects are moving away from us) to measure the expansion of
the universe,” said Paul Martini, a coordinator of the analysis and professor
 of astronomy at The Ohio State University.

Measuring dark energy’s influence across the history of the universe shows
how dominant a force it has been.

Researchers began to notice when they combined these observations with other
measurements of light across the universe such as exploding stars, the gravity
-warped light of distant galaxies, and the light leftover from the dawn of the
 universe, called the cosmic microwave background, the DESI data shows that
dark energy’s impact could be weakening over time.

“If this continues then eventually dark energy will not be the dominant force
 in the universe,” Ishak-Boushak said in an email. “Therefore the universe
expansion will stop accelerating and will go at a constant rate or even in
some models could also stop and collapse back. Of course, these futures are
very remote and will take billions and billions of years to happen. I’ve
worked on the question of cosmic acceleration for 25 years, and my perspective
 is, if the evidence continues to grow, and it is likely to, then this will be
 huge for cosmology and all of physics.”

Solving an enduring mystery
There isn’t enough evidence yet to declare a groundbreaking discovery that
definitively says dark energy is evolving and weakening, but that could change
 within just a couple of years, Ishak-Boushak said.

“My first big question is if we will continue to see evidence for evolving
dark energy as our measurements get better and better,” Martini said. “If we
 do get to the point where the evidence is overwhelming, then my next
questions will be: How does dark energy evolve? And what are the most likely
physical explanations?”

The new data release could also help astrophysicists better understand how
galaxies and black holes evolve and the nature of dark matter. Although dark
matter has never been detected, it is believed to make up 85% of the total
matter in the universe.

Scientists involved with the collaboration are eager to improve their
measurements using DESI.

“Whatever the nature of dark energy is, it will shape the future of our
universe,” said Michael Levi, DESI director and a scientist at the Lawrence
Berkeley National Laboratory. “It’s pretty remarkable that we can look up at
 the sky with our telescopes and try to answer one of the biggest questions
that humanity has ever asked.”

A new experiment called Spec-S5, or Stage 5 Spectroscopic Experiment, could
measure more than 10 times as many galaxies as DESI to study both dark energy
and dark matter, Martini said.

“Spec-S5 would use telescopes in both the northern and southern hemispheres
to map galaxies across the entire sky,” Martini said. “We are also excited
about how the (Vera) Rubin telescope will study supernovae, and provide a new,
 uniform dataset to study the (universe’s) expansion history.”

Other space observatories, like the Euclid space telescope and the Nancy Grace
 Roman Space Telescope, set to launch in 2027, will also contribute more key
measurements of dark matter and dark energy in the coming years that could
help fill in the gaps, said Jason Rhodes, an observational cosmologist at NASA
’s Jet Propulsion Laboratory in Pasadena, California. Rhodes, who is not
involved in DESI, is the US science lead for Euclid and principal investigator
 for NASA’s Euclid dark energy science team.

Rhodes, who calls the results intriguing, said the data shows a slight but
persistent tension between measurements from the early days of the universe
and those from the later universe.

“(This means) that our simplest model of dark energy doesn’t quite allow for
 the early universe we observe to evolve into the late universe we observe,”
Rhodes said. “DESI results (and some other recent results) seem to indicate
that a more complex model of dark energy is preferred.This is truly exciting
 because it may mean that new, unknown, physics governs the evolution of the
universe. DESI has given us tantalizing results that may indicate a new model
of cosmology is needed.”

中文翻譯：

「另一個令人震驚的變化」：新數據顯示神秘暗能量正在演變

這是迄今為止最廣泛的宇宙調查之一，它提供的新線索表明，神秘的暗能量可能正在以某
種方式演變，從而改變天文學家對宇宙的理解。









科學家表示，這項發現使天文學家距離揭開暗能量的神秘本質又更近了一步，這可能意味
著宇宙運作的標準模型也需要更新。

深入觀察宇宙


來自星係等天體的光需要時間才能到達地球，這意味著 DESI 可以有效地看到從數十億年
前到現在不同時間點的宇宙狀況。

「DESI 與其他機器不同，它能夠同時觀察獨立物體，」錫耶納學院物理學教授、數據發
布的共同負責人約翰· 穆斯塔卡斯 (John Moustakas) 說。

最新發現涵蓋的宇宙物體數據比不到一年前調查和呈現的數據多了一倍多。 2024 年的啟
示首次暗示了暗能量可能如何演變。



越來越多的宇宙證據




測量暗能量在宇宙歷史中的影響可以顯示它是多麼強大的力量。





解開一個持久的謎團
伊沙克-布希克表示，目前還沒有足夠的證據來宣布一項突破性的發現，明確表明暗能量
正在演變和減弱，但這種情況可能會在短短幾年內改變。



新發布的數據還可以幫助天文物理學家更好地理解星系和黑洞如何演化以及暗物質 的性
質。儘管暗物質從未被偵測到，但人們認為它佔宇宙中總物質的85%。

參與合作的科學家們渴望利用 DESI 來改進他們的測量方法。



馬蒂尼表示，一項名為 Spec-S5（第五階段光譜實驗）的新實驗可以測量比 DESI 多 10
倍的星系，以研究暗能量和暗物質。





羅德斯稱這些結果非常有趣，他表示數據顯示，對宇宙早期和晚期的測量結果之間存在輕
微但持續的矛盾。



5.完整新聞連結 (或短網址)不可用YAHOO、LINE、MSN等轉載媒體:
https://edition.cnn.com/2025/04/02/science/desi-dark-energy-results/index.html


6.備註:
美國科學家使用暗能量光譜儀（DESI）繪製宇宙最大3D地圖，未來將更精確測量宇宙歷史


--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 1.163.211.212 (臺灣)
※ 作者: herculus6502 2025-04-03 04:01:58
※ 文章代碼(AID): #1dxPUwHh (Gossiping)
※ 文章網址: https://www.ptt.cc/bbs/Gossiping/M.1743624122.A.46B.html

作者 herculus6502 的最新發文:

• +4 [新聞] CNN：新數據顯示神秘暗能量正在演變 - Gossiping 板

  作者: herculus6502 1.163.211.212 (台灣) 2025-04-03 04:01:58

  7F 4推
• +4 [地震] 地震 - Gossiping 板

  作者: herculus6502 114.27.77.207 (台灣) 2025-01-16 03:02:49

  9F 5推 1噓
• +14 [問卦] 聽說槍手死了? - Gossiping 板

  作者: herculus6502 111.71.92.23 (台灣) 2024-07-14 07:27:53

  34F 14推
• +6 [好雷] 今天是 The Thirteenth Floor Day (有雷) - movie 板

  作者: herculus6502 42.78.4.207 (台灣) 2024-06-21 07:06:59

  13F 6推
• +9 [心得] 下重注的本事：當道投資人的高勝算法則 Mohnish Pabrai 訪談 - Stock 板

  作者: herculus6502 42.79.220.126 (台灣) 2024-05-23 20:37:14

  20F 10推 1噓

點此顯示更多發文記錄