Technologies

Astronomers search for alien tech among billions of stars but come up empty

It’s all quiet in the galactic center.

Using one of the world’s most sensitive radio telescopes, a trio of Australian researchers has gone alien hunting in the heart of the Milky Way. In late 2020, they pointed their ears toward the galactic center, listening for alien technosignatures. In their field of view lay 144 known exoplanets and, potentially, billions of stars.

But after keeping their ears to the sky for more than seven hours, they didn’t hear anything plausibly alien. It seems awfully quiet out there.

The search was conducted by the Murchison Widefield Array, a collection of 4,096 spider-like antennas planted in the Western Australian desert. The antennas, arranged in 256 tiles, can pick up low-frequency radio waves from space. Importantly, the array has a wide field of view, which means researchers can listen out for technosignatures — signals broadcast by intelligent life — across a huge region of space. «We are looking for long sustained signals or technological leakages from the inhabitants daily lives,» says Chenoa Tremblay, a researcher with the SETI Institute in California.

The search is described in a new paper, which appeared Monday on preprint repository arXiv (PDF) and has been accepted for publication in the journal Publications of the Astronomical Society of Australia.

This isn’t the first time the team has used MWA to hunt for alien signals, either. They previously examined the dark forest of our cosmos back in 2020 using the MWA, analyzing over 10 million stars, studied the galactic center back in 2013 and performed a search toward the Orion nebula in 2018. They didn’t hear boo from any aliens in those three surveys, either.

However, the new search is different in a few keys ways, according to Tremblay, who is also first author of the new study. The previous search of the galactic center, in 2013, only contained 38 known exoplanets whereas the new search contained 144. «This is our largest population of known exoplanets within our four surveys with the MWA,» Tremblay says.

Hunting for life around the galactic center is particularly useful because the region contains the highest density of stars within our galaxy. Where there are stars, there may be planets and where they are planets… well, you get the drift. «[M]odelling and our large catalogue of known solar systems suggest that there are high chances of habitable planets toward the Galactic centre,» Tremblay notes.

The amount of stars in the new search is difficult to accurately predict because the galactic center is mighty dusty, obscuring the view of surveys and preventing an accurate read. Previous searches have used data from the Gaia Space Observatory to count the amount of stars but that doesn’t work in the galactic center. Tremblay explains that the team used a different survey, known as Galactic Nucleus, which classified 3.3 million stars. However, the survey covers less than 1% of the area surveyed by MWA.

«If we extrapolate this, we are covering billions of stellar systems out to the centre of our Galaxy,» Tremblay notes.

That’s, in theory, a lot of chances to hear from extraterrestrial friends. However, it’s still just a mere drop in the cosmic ocean — there’s plenty of other places alien technosignatures could be emanating from.

It was also the first time a search has been conducted at a high frequency of 155 MHz. This reduced the chance of picking up daily Earth communications and interference. Previous searches focused on lower frequencies between 98 and 133MHz. Of course, that comes with a big caveat: We’re kind of assuming these alien technologies are using the same technologies to broadcast as we are.

The MWA is currently undergoing an upgrade that will allow searches at different frequencies and time resolution, giving it the ability to match other searches for technosignatures like those conducted by the Breakthrough Listen collective. Tremblay notes that all 256 of the tiles containing the spider-like antennas will be able to image the sky when the upgrades are complete.

Technologies

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Technologies

Today’s NYT Strands Hints, Answers and Help for Oct. 22 #598

Here are hints and answers for the NYT Strands puzzle for Oct. 22, No. 598.

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

Today’s NYT Strands puzzle is a fun one — I definitely have at least two of these in my house. Some of the answers are a bit tough to unscramble, so if you need hints and answers, read on.

I go into depth about the rules for Strands in this story.

If you’re looking for today’s Wordle, Connections and Mini Crossword answers, you can visit CNET’s NYT puzzle hints page.

Read more: NYT Connections Turns 1: These Are the 5 Toughest Puzzles So Far

Hint for today’s Strands puzzle

Today’s Strands theme is: Catch all.

If that doesn’t help you, here’s a clue: A mess of items.

Clue words to unlock in-game hints

Your goal is to find hidden words that fit the puzzle’s theme. If you’re stuck, find any words you can. Every time you find three words of four letters or more, Strands will reveal one of the theme words. These are the words I used to get those hints but any words of four or more letters that you find will work:

BATE, LICE, SLUM, CAPE, HOLE, CARE, BARE, THEN, SLAM, SAMBA, BACK

Answers for today’s Strands puzzle

These are the answers that tie into the theme. The goal of the puzzle is to find them all, including the spangram, a theme word that reaches from one side of the puzzle to the other. When you have all of them (I originally thought there were always eight but learned that the number can vary), every letter on the board will be used. Here are the nonspangram answers:

TAPE, COIN, PENCIL, BATTERY, SHOELACE, THUMBTACK

Today’s Strands spangram

Today’s Strands spangram is JUNKDRAWER. To find it, look for the J that’s five letters down on the far-left row, and wind down, over and then up.

Quick tips for Strands

#1: To get more clue words, see if you can tweak the words you’ve already found, by adding an «S» or other variants. And if you find a word like WILL, see if other letters are close enough to help you make SILL, or BILL.

#2: Once you get one theme word, look at the puzzle to see if you can spot other related words.

#3: If you’ve been given the letters for a theme word, but can’t figure it out, guess three more clue words, and the puzzle will light up each letter in order, revealing the word.

Technologies

Today’s Wordle Hints, Answer and Help for Oct. 22, #1586

Here are hints and the answer for today’s Wordle for Oct. 22, No. 1,586.

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

Today’s Wordle puzzle features some letters I don’t often guess, but it’s not terribly difficult. If you need a new starter word, check out our list of which letters show up the most in English words. If you need hints and the answer, read on.

Today’s Wordle hints

Before we show you today’s Wordle answer, we’ll give you some hints. If you don’t want a spoiler, look away now.

Wordle hint No. 1: Repeats

Today’s Wordle answer has one repeated letter.

Wordle hint No. 2: Vowels

Today’s Wordle answer has one vowel.

Wordle hint No. 3: First letter

Today’s Wordle answer begins with S.

Wordle hint No. 4: Last letter

Today’s Wordle answer ends with T.

Wordle hint No. 5: Meaning

Today’s Wordle answer can refer to an action displaying spectacular skill and daring.

TODAY’S WORDLE ANSWER

Today’s Wordle answer is STUNT.

Yesterday’s Wordle answer

Yesterday’s Wordle answer, Oct. 21, No. 1,585 was DETOX.

Recent Wordle answers

Oct. 17, No. 1,581: GROSS
Oct. 18, No. 1,582: HAVEN
Oct. 19, No. 1,583: IDEAL
Oct. 20, No. 1,584: LIMBO

Quick tips for Wordle

#1: Check our list ranking the popularity of all the letters in the alphabet and choose your starter words accordingly. (TRAIN, STERN and AUDIO are good.)

#2: Don’t forget that letters can be used more than once.

#3: Many words are similar. You don’t want to use up multiple guesses that don’t advance your cause. So if the puzzle is STA_E, don’t guess STARE, STATE and STALE. Guess something that uses that R, T and L, like TWIRL.