theSIGNAL SCIENCE
31 May 2026
"The universe is under no obligation to make sense to you."
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Science

Ancient galaxy defies bar formation theories

A stellar bar has been detected in a massive, dust-shrouded galaxy just 1.5 billion years after the Big Bang.

Astronomers led by Leindert A. Boogaard of Leiden University have identified a stellar bar in GN20, a gas-rich starburst galaxy observed at redshift 4.055, a finding that appears to challenge several assumptions that have long underpinned models of early galactic evolution. The discovery, which was submitted to the arXiv preprint server in May 2025, was made possible by the James Webb Space Telescope's Mid-Infrared Instrument and Near-Infrared Camera, instruments sensitive enough to peer through the thick layers of dust that had previously obscured GN20's internal architecture. Stellar bars are elongated, rigidly rotating concentrations of stars that cut across galactic centres, and they are thought to play a significant role in a galaxy's evolution by funnelling gas inward, triggering star formation, and feeding central black holes. While bars are considered common in the present-day universe — the Milky Way itself is believed to host one — their formation has generally been understood to require billions of years to complete. Gas-rich environments, such as those that characterised early galaxies, were also expected to suppress or delay bar formation rather than accommodate it. The bar identified in GN20 spans approximately seven kiloparsecs and was detected through isophotal analysis, a technique that measures how the brightness of a galaxy's light stretches and rotates outward from its centre. A separate mathematical analysis of the light distribution confirmed the structure independently, and the stellar bar was found to align closely with a dust feature mapped by the NOrthern Extended Millimeter Array, lending further weight to the detection.…

JWST and NOEMA imaging reveals a 7-kiloparsec stellar bar in galaxy GN20.
Discuss
  • Why were gas-rich environments previously thought to prevent stellar bar formation in early galaxies?
  • How does isophotal analysis allow astronomers to identify hidden structures inside distant galaxies?
  • What role might stellar bars have played in accelerating star formation in the very early universe?
  • In what ways does the GN20 finding challenge the standard cosmological model of galaxy evolution?
  • How do multi-telescope observations strengthen or complicate claims about distant galactic structures?
Science

Blue Origin rocket explosion threatens lunar programme

A New Glenn rocket belonging to Jeff Bezos's Blue Origin exploded during a scheduled hotfire test at Kennedy Space Center in Florida, destroying the launchpad in a fireball that was visible as far as 185 kilometres away. No injuries were reported among company employees, though the explosion sent shockwaves across Florida's Space Coast and was seen by residents as far north as South Carolina. The vehicle is the same rocket type that Blue Origin intends to use to deliver lunar landers to the moon for NASA.

The incident is considered likely to affect NASA's Artemis programme and its broader $20 billion lunar base initiative, with NASA Administrator Jared Isaacman stating that a full evaluation of the mission timeline would be undertaken. Blue Origin described the event as an anomaly, while Bezos acknowledged it had been a very rough day, though he expressed confidence that the company would rebuild and resume operations. The explosion comes just days after NASA confirmed Blue Origin had won a contract to launch the first of three planned moon base construction missions this year.
  • How might this explosion affect the competitive balance between Blue Origin and SpaceX?
  • What contingency plans should NASA maintain when relying on private launch providers?
∞
Spaceflight is unforgiving…
Jared Isaacman, NASA Administrator
Science

Biotech entrepreneur pursues controversial embryo gene editing

Cathy Tie, a Canadian biotech entrepreneur who married and subsequently separated from He Jiankui — the biophysicist who was imprisoned for creating the world's first gene-edited babies — has established a startup in New York that aims to conduct human embryo gene editing to prevent hereditary diseases including cystic fibrosis, Huntington's disease, and certain cancers. Tie, who turned 30 this year, has been banned from China, the country of her birth, and has lived across multiple cities since the start of 2025 while simultaneously founding three separate biotech ventures.

Unlike her former husband, whose work was widely condemned as reckless and illegal, Tie has stated that she intends to operate transparently and with regulatory approval, while seeking venture capital investment to fund her ambitions. Her stated approach raises significant ethical and scientific questions that remain contested among researchers, bioethicists, and policymakers, particularly regarding where the boundary lies between disease prevention and the broader genetic modification of human life. How regulators in any jurisdiction might respond to such proposals is not yet clear.
  • What ethical distinctions, if any, exist between gene editing for disease prevention and enhancement?
AMERICAS · Science
‘There is no way to stop this’: ‘Biotech Barbie’ Cathy Tie on her mission to genetically modify babies
GLOBAL · Science
JWST finds a stellar bar in the early universe that breaks all rules
WORLD · Science
They call it stupid hot for a reason: Heat muddles animal brains
AFRICA · Science
Unearthing Namibia’s forgotten genocide through forensic archaeology
theSIGNAL IN THE LAB
1VOCABULARY
isophotal analysisstarburst galaxy
anomalystellar barhereditary diseases
cosmic epochlaunchpad
2GRAMMAR FOCUS
Causative have/get — have something done
Use 'have/get + object + past participle' to describe an arrangement where someone else performs an action for you. For example: 'The team had the data analysed by an independent lab.'
analysed · detected · evaluated · mapped · confirmed · destroyed · approved
  1. The research team had the light distribution independently using a separate mathematical method.
  2. Astronomers had the stellar bar's position against a dust feature recorded by the NOrthern Extended Millimeter Array.
  3. Before the discovery, scientists had never had GN20's internal architecture because of its thick dust layers.
  4. NASA Administrator Jared Isaacman stated that the agency would have the full mission timeline following the explosion at Kennedy Space Center.
  5. Blue Origin will need to have the launchpad rebuilt before any further rocket tests can take place.
  6. Cathy Tie says she intends to have all embryo gene-editing procedures by the relevant regulatory authorities before proceeding.
  7. The James Webb Space Telescope allowed scientists to have the galaxy's structure for the first time at such an early cosmic epoch.
3IDIOMS
Define each idiom in your own words. Then write one in a sentence of your own.
  1. to peer through (something)
  2. to play a significant role
  3. to lend weight to (something)
  4. a rough day
  5. to draw a line (between two things)
  6. to send shockwaves (across/through something)
4CRITICAL THINKING
All three articles involve pushing boundaries — scientific, technological, and ethical — in ways that challenge existing rules or assumptions. To what extent should the pace of discovery or commercial ambition be allowed to outrun the regulatory frameworks designed to govern them? Consider evidence from at least two of the articles in your response.
5CREATIVE · HEADLINES
Write a headline for the top story in each style:
  • Tabloid newspaper
  • Luxury magazine
  • Activist blog
6WRITING
Cathy Tie argues that transparency and regulatory approval make her embryo gene-editing work fundamentally different from He Jiankui's. Write a 250-word essay arguing either that this distinction is sufficient to justify proceeding, or that the scientific and ethical risks remain too great regardless of intent.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong. Fill in the missing word(s) from the articles or your own knowledge.
  • question→→
  • affect→→
  • unusual→→
  • fire→→
  • controversial→→
  • unclear→→
  • difficult day→→
8SPEAKING
  1. Should scientists be allowed to edit human embryo genes?
  2. Can space exploration justify billion-dollar budget risks?
  3. Does ancient galaxy news change how you view the universe?
  4. Who should regulate gene editing startups like Tie's?
  5. Is transparency enough to make controversial science acceptable?