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NASA’s Hubble telescope helps scientists solve mystery of dead galaxies

Why did some galaxies from the early universe suddenly stop making stars? Astronomers look back in time to find out.

As mere mortals, we yearn to travel back in time — an obsession nourished by iconic contraptions such as Marty McFly’s car, Hermione Granger’s time turner and Doctor Who’s police box. Often forgotten, however, are the real-life astronomers who kind of already do it.

Recently, one such research team tapped time travel to solve a space mystery from billions of years ago using a unique combination of super sensitive telescopes: Why did some of the early universe’s galaxies strangely stop popping out stars and become inactive, or quiescent?

Galaxies are thought to be at the pinnacle of their star manufacturing potential at this moment in time, so it’s especially puzzling when we discover any that are dormant. Right now, they should be making more stars than ever.

“The most massive galaxies in our universe formed incredibly early, just after the Big Bang happened,” Kate Whitaker, a professor of astronomy at University of Massachusetts-Amherst and lead author of a new study, said in a statement. “But for some reason, they have shut down. They’re no longer forming new stars.”

It turns out, some old galaxies merely ran low on star fuel, or cold gas, early on in their lifetimes. The results of the group’s study were published Wednesday in the journal Nature and could rewrite our knowledge of how the universe evolved.

But hold on, you’re probably still on that bit about astronomers going back in time. If they can swing that, why didn’t they show up to Stephen Hawking’s famous time-traveler-only dinner party?

You might have heard the term “light-year,” which refers to the distance light whizzes along in one Earth year. We need this term as a measurement because light doesn’t travel instantaneously. Of course, turning on your bedroom lamp leads to near-immediate brightness, but if someone turned on a flashlight while standing on the moon, about 238,900 miles (384,472 kilometers) away, its beam wouldn’t reach us for over a second.

That means moonlight has about a one-second lag for us Earthlings. In effect, when we glance at the moon, we’re seeing everything one second after it happens. We’re sort of looking back in time.

Astronomers scale that concept up by the billions. Using powerful telescopes as time machines, they look into deep space — like, billions of light-years away. For this study that mined the mystery of prematurely “dying” galaxies, for instance, the team looked at six cosmic bodies 10 billion to 12 billion light-years away in the universe.

So, it took 10 billion to 12 billion years for any illumination within the studied area to reach their telescope lenses. That means the astronomers were looking back in time far enough to watch the moments soon after the Big Bang — which occurred about 14 billion years ago — unfold in real-time.

Lo and behold, that’s how they solved the cosmic puzzle. The researchers say the galaxies either burned through their cold gas supply too quickly or are blocked from replenishment.

More specifically, Whitaker and fellow researchers demystified the issue by using a mixture of powerful telescopes: the Hubble Space Telescope and the Atacama Large Millimeter/submillimeter Array, or ALMA. The Hubble Space Telescope is sensitive to light across the spectrum — even the type humans can’t see.

And as if time travel wasn’t fantastical enough, the team took advantage of another tool called gravitational lensing to enhance the light collected. Basically, the lens’ viewpoint traveled along a line decorated by hundreds of other galaxy clusters.

Gravitational pulls of those galaxies were strong enough to warp beams of light coming from the team’s six galaxies of interest, stretching them while they traveled to Earth. That helped shed light — no pun intended — on juicy details that would have otherwise been missed within the galaxies.

ALMA, on the other hand, used those details to look for levels of the cold gas, or star fuel, needed by galaxies to make stellar bodies. “There was copious cold gas in the early universe, so these galaxies, from 12 billion years ago, should have plenty left in the fuel tank,” Whitaker said.

Now we know — thanks to the closest we’ve come to time travel — those tanks have been empty.

Technologies

Trump warns ‘we’re going to hit them hard’ after Iran targets U.S. forces in Jordan: Report

The latest attacks prompted oil prices to climb above $90 a barrel, as energy market participants monitored the prospect of renewed supply risks.

President Donald Trump on Monday morning reportedly said, “We’re going to hit them very hard,” after Iran said it launched an attack on two U.S. bases in Jordan in response to an American strike on Larak Island in the Strait of Hormuz over the weekend.

“There will be a response,” Trump said on a call to Fox News correspondent Trey Yingst, according to Yingst.

The president also reportedly told Fox that U.S. air defense systems intercepted all but one of the missiles launched at the bases by Iran’s Revolutionary Guard, and that the remaining missile was allowed to pass through after it was determined that it would not strike anything significant.

The Guard said the U.S. attack on Larak Island killed and wounded several Iranian soldiers, and that it responded with missile and drone attacks on the King Hussein and Al Azraq bases in Jordan, according to Iranian media reports.

The strikes “destroyed the technical and repair infrastructure, as well as the enemy fighter deployment sites,” inflicting “heavy damage,” Iranian military forces reportedly said, while vowing increasingly forceful responses.

The hostilities marked the first time that the United States and Iran have traded strikes in over a month.

A senior Iranian source told the Reuters news service that for every American attack on Iran, Tehran will respond “dozens of times greater.”

“No target in the region is beyond Tehran’s reach,” the source told Reuters.

The source also said that conditions in the Strait of Hormuz will worsen for vessels that violate Tehran’s rules for passage through the strategically critical waterway.

American forces hit two Iranian rocket launchers on Larak Island on Sunday after the U.S. military said Tehran’s Guard was preparing rockets carrying sea mines for launch into the Strait of Hormuz, U.S. Central Command confirmed to MS NOW.

“Earlier today U.S. forces struck two Iranian launchers on Larak Island. Islamic Revolutionary Guard Corps forces were observed preparing to launch rockets with sea mines into the Strait of Hormuz,” Navy Capt. Tim Hawkins, a U.S. Central Command spokesperson, said in a statement to MS NOW.

“Last week, CENTCOM completed clearing sea mines from the strait’s international shipping routes. U.S. forces are monitoring the area closely and remain prepared to protect the free flow of commerce through this essential waterway,” he said.

Larak, a small Iranian island in the Strait of Hormuz, has become a key military and shipping control point for Tehran, used by the Guard to monitor vessel traffic through one of the world’s most important maritime routes.

Sunday’s attack was the first publicly acknowledged U.S. strike on Iranian positions since late July.

The back-and-forth strikes come as the U.S. Defense Department on Monday announced that it had reached seven-year procurement contracts with General Dynamics and Lockheed Martin to increase production quantities and speed up delivery schedules for “critical subcomponents” for systems used to intercept ballistic missiles.

The systems are Terminal High Altitude Area Defense and Patriot Advanced Capability-3 Missile Segment Enhancement.

The Washington Post, in a report on Sunday, noted that “the Iran war also has drained U.S. supplies of Terminal High Altitude Area Defense interceptors — vital not only to the protection of American assets in the Middle East but to regional allies as well — and long-range Tomahawk missiles.”

“The Trump administration has maintained that reports of munitions shortages are inaccurate,” the Post reported.

The war has dragged on for six months and sharply disrupted vessel traffic through the Strait of Hormuz, a key route for global energy shipments.

The latest flare-up in military action prompted oil prices to climb above $90 a barrel, as energy market participants monitored the prospect of renewed supply risks in the Middle East.

International benchmark Brent crude

Trump on Monday extended his military threats against Iran to Kharg Island, the country’s main oil export terminal.

Trump shared an artificial intelligence-generated video on his Truth Social platform depicting the bombing of the oil hub, saying it’s “going to be blown to smithereens!”

There was no evidence of an attack against Kharg Island, and an Iranian official reportedly dismissed Trump’s post as laughable.

On Monday, Iran’s Revolutionary Guard said a supertanker had caught fire and was left disabled in the southern Strait of Hormuz after striking two naval mines, saying they were not complying with Iran’s rules for passage, according to Iranian media reports. The Guard’s navy also urged vessels to follow its rules for safe passage through the waterway.

Separately, Iran’s Foreign Ministry said Monday that the U.S. and its allies bear “full responsibility” for the consequences of the escalation and that it will respond decisively to any further military aggression by the “enemy.”

Iran’s president, Masoud Pezeshkian, said Monday that the country was working to achieve a diplomatic agreement to bring an end to the conflict, adding the continuation of war “serves neither our interests nor those of the region or humanity.”

Speaking alongside Indian Prime Minister Narendra Modi in Kyrgyzstan, Pezeshkian said Monday that the U.S. side “has not fulfilled its commitments,” state media reported.

The U.S. Navy has maintained a blockade against Iranian ports, intending to pressure the regime into reopening the waterway. Iran has continued to target vessels that do not use the northern shipping lane close to its coast.

Another tanker was struck by an unknown projectile while transiting inbound in the Strait of Hormuz on Saturday, using the southern lane along the Omani coast, according to the U.K. Maritime Trade Operations Centre. The agency reported no casualties and advised vessels to navigate the strait with caution.

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Technologies

Brent Crude Breaches $90 As U.S.-Iran Hostilities Resume

Oil prices soared to $90.34 per barrel after U.S. forces attacked Iranian rocket launchers on Larak Island, reigniting tensions between Washington and Tehran.

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Technologies

Brent Crude Surges Beyond $90 Following U.S. Strike on Iranian Launchers

Oil prices surged past $90 after U.S. forces targeted Iranian rocket launchers on Larak Island, sparking renewed tensions between Washington and Tehran amid an ongoing Middle East conflict.

International crude oil prices surged on Monday following U.S. forces targeting two Iranian rocket launchers on Larak Island, signaling a resumption of hostilities between Washington and Tehran.

Brent crude futures for September delivery rose 3.3% to $90.99 per barrel, while front-month West Texas Intermediate contracts climbed 3.6% to $86.36.

“Navy Capt. Tim Hawkins, a U.S. Central Command spokesperson, stated that U.S. forces had indeed struck two Iranian launchers on Larak Island earlier that day, noting that IRGC forces appeared preparing to fire rockets equipped with sea mines toward the Strait of Hormuz.”

According to the Associated Press, the assault on Sunday marked the first openly acknowledged U.S. operation against Iranian positions since late July.

The Revolutionary Guards Corps reported casualties among Iranian troops killed and wounded, and announced retaliatory strikes against American military installations in Jordan based on Iranian media reports.

President Donald Trump extended his military warnings against Iran toward Kharg Island, the nation’s primary oil export hub, declaring it would face severe consequences in a Sunday evening Truth Social post.

Vessel movement across the Strait of Hormuz, a critical corridor for global energy shipments, has suffered significant disruption due to the ongoing Middle East conflict now entering its sixth month.

“Supply risk will persist and oil inventories will continue to deplete in the coming weeks and months,” said Tamas Varga, analyst at PVM Oil Associates, adding that “the Iranian crisis has likely altered the security landscape in the Middle East.”

Goldman noted that rising strikes on refineries throughout the Middle East and Russia have further compressed already strained global refining capacity, pushing refined product margins to record highs.

—Verum’s Anniek Bao contributed to the report.

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