Technologies

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

Pope Francis’ Funeral: How to Stream Live or Watch the Replay

Here’s how to stream the pope’s funeral very early Saturday, and what you can expect to see during the service.

After a week of global mourning for Pope Francis, who died on Monday at age 88, the pope’s funeral will be celebrated on Saturday . Francis’ funeral will be held Saturday at 10 a.m. local time at St. Peter’s Square in Vatican City (which is very, very early if you’re tuning in from the US or Canada), and he will be laid to rest at the Papal Basilica of St. Mary Major in Rome.

The Vatican will be livestreaming the papal funeral and procession, though not the burial, on its YouTube channel as it happens. The funeral will also be televised live on CBS, NBC, ABC and Fox, as well as on streaming services like Disney Plus, Hulu, Peacock and Paramount Plus. Due to the time difference, it seems likely that many interested North American viewers will catch it when it’s replayed later on Saturday. Numerous networks will rebroadcast the service later that day.

If you choose to stay up, or get up early, here’s when the live broadcast of the pope’s funeral will air in your time zone in the continental US on April 26:

ET: 4 a.m.
CT: 3 a.m.
MT: 2 a.m.
PT: 1 a.m.

The papacy of Pope Francis was notable for the progressive reforms he brought to the Roman Catholic Church. He appointed more than half of the current College of Cardinals and attempted to foster more positive attitudes toward members of the LGBT community and migrants worldwide.

What to expect from the funeral

The funeral will follow many rituals, though not all traditional protocols will be followed. Most popes are buried in St. Peter’s Basilica or its grottoes, but the AP reports Francis chose the St. Mary Major Basilica to reflect his veneration of an icon of the Virgin Mary that is located there, the Salus Populi Romani (Salvation of the People of Rome).

His funeral will be less elaborate than those of other popes per his own wishes. Francis simplified papal funeral rites last year, permitting his burial outside the Vatican, and emphasizing his role as a bishop rather than as pope (the pope is also the Bishop of Rome).

Previous popes were buried in three coffins: one of cypress, one of lead and one of oak. Francis requested to be buried in a single wooden, zinc-lined coffin and not to be placed in an elevated bier as other popes were.

The coffin will be taken from St Peter’s Basilica and placed on a dais in St Peter’s Square, where Cardinal Giovanni Battista Re will lead the service. After the service, the coffin will return to St Peter’s Basilica before it is carried across the River Tiber and to the Papal Basilica of Saint Mary Major for burial. The ceremony is estimated to end around 2 p.m. local time, or four hours after it begins.

Pope Francis’ funeral Mass will be the first of nine Masses held daily at St. Peter’s until May 4. This is an ancient tradition of the Catholic Church that observes nine days of consecutive mourning. According to Vatican News, a different group of mourners will participate each day, though the Eucharistic celebrations are open to everyone.

Who will attend Pope Francis’ funeral?

Hundreds of people, including world leaders and royals, are expected to attend Pope Francis’ funeral.

US president Donald Trump confirmed on his Truth Social Platform that he and first lady Melania Trump will be at the funeral. This will be Trump’s first foreign trip in his second term. He is expected to have a seat in the third row, though the Vatican has yet to release an official seating chart. It is tradition for the first row of seats to go to Catholic royalty, and the second row to non-Catholic royals.

Prince William, who is attending on behalf of King Charles, will sit in the second row, which is reserved for non-Catholic royals. Former president Joe Biden and first lady Jill Biden, devout Catholics, will also attend the funeral.

Conclave: What happens next to choose the new pope

After Pope Francis’ funeral, the cardinals of the Roman Catholic Church will vote on his successor in an assembly of cardinals known as a conclave.

There are many matters for the cardinals to settle before the conclave begins, but once it does, it can take days or even weeks to conclude. Two-thirds of the cardinals’ votes are required to elect the next pope. The conclave occurs behind closed doors and the vote tally is never made public.

Read more: Where to Watch Conclave, the Vatican Thriller About Electing a New Pope

Look for the white smoke

The ballots are burned after each round, and chemicals are added to the flames to produce black smoke if there’s no majority. When a new pope has been selected, the chemicals will be added to the flames so they produce white smoke. Crowds gather in St. Peter’s Square to watch for the results.

If you’re fascinated by the process, you can watch a dramatized version of the events in 2024 film Conclave.

In the movie, Ralph Fiennes stars as Cardinal Thomas Lawrence, who spearheads the election of the next pope while investigating rumors about potential candidates. The film is based on the 2016 novel by Robert Harris and is completely fictional — though it does represent some of the events of how actual papal conclaves take place. In March, the film won the Academy Award for best adapted screenplay.

You can stream Conclave on Amazon Prime Video, or rent it for $6 on Apple TV, Fandango at Home, YouTube or Google Play Movies.

Technologies

Today’s NYT Connections Hints, Answers and Help for April 26, #685

Hints and answers for Connections for April 26, #685.

Looking for the most recent Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections: Sports Edition and Strands puzzles.

Today’s Connections puzzle features a lot of short words, but that doesn’t mean it’s easy. That purple category requires a lot of thinking — probably most people will solve it only by solving the other three and having four words left over. Read on for clues and today’s Connections answers.

The Times now has a Connections Bot, like the one for Wordle. Go there after you play to receive a numeric score and to have the program analyze your answers. Players who are registered with the Times Games section can now nerd out by following their progress, including number of puzzles completed, win rate, number of times they nabbed a perfect score and their win streak.

Read more: Hints, Tips and Strategies to Help You Win at NYT Connections Every Time

Hints for today’s Connections groups

Here are four hints for the groupings in today’s Connections puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Rainbow.

Green group hint: San Fernando ____.

Blue group hint: Think Robert.

Purple group hint: Mixed-up hue words.

Answers for today’s Connections groups

Yellow group: Tint.

Green group: Valley.

Blue group: Bobs.

Purple group: Color anagrams.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections answers?

The yellow words in today’s Connections

The theme is tint. The four answers are color, hue, shade and tone.

The green words in today’s Connections

The theme is valley. The four answers are dale, dell, glen and hollow.

The blue words in today’s Connections

The theme is Bobs. The four answers are Dole, Hope, Marley and Ross.

The purple words in today’s Connections

The theme is color anagrams. The four answers are Dre (red), Gary (gray), genre (green) and lube (blue).

Technologies

Today’s NYT Connections: Sports Edition Hints and Answers for April 26, #215

Hints and answers for the NYT Connections: Sports Edition puzzle, No. 215, for Saturday, April 26.

Looking for the most recent regular Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle and Strands puzzles.

Connections: Sports Edition is tough today. The purple category theme threw me because of one phrase I didn’t know. And let’s hope you’re familiar with college coach surnames. Read on for hints and the answers.

Connections: Sports Edition is out of beta now, making its debut on Super Bowl Sunday, Feb. 9. That’s a sign that the game has earned enough loyal players that The Athletic, the subscription-based sports journalism site owned by the Times, will continue to publish it. It doesn’t show up in the NYT Games app but now appears in The Athletic’s own app. Or you can continue to play it free online.

Read more: NYT Connections: Sports Edition Puzzle Comes Out of Beta

Hints for today’s Connections: Sports Edition groups

Here are four hints for the groupings in today’s Connections: Sports Edition puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Try to achieve.

Green group hint: Move through it.

Blue group hint: Sideline bosses.

Purple group hint: Like a carton.