Space · Monday, 31 August 2026

01 Briefing what happened

Thousands of cheap satellites were meant to be too many to shoot at. They all fly at the same few heights.

Space 1 min 51 sources

The answer to satellites being attacked was to launch thousands of cheap ones instead of a few costly ones. At a conference in Utah this week, security researchers said the copies share an altitude, a supplier and a software update, and a weapon aimed at what they share reaches all of them at once.

16,900

more satellites under 500 kilograms expected to launch over the next decade

private money into small satellites reached about $11.5 billion in 2025 [2]

3 in 4

of all working satellites that can steer themselves are one company's Starlink craft

SpaceX says it has also launched over 80% of the world's mass to orbit each year since 2023 [3]

48%

of the public catalogue of orbiting objects is all SpaceX's own tracking system can see

it follows about 16,500 objects and cannot detect anything much under a metre across [4]

$123.9m

spent by the US Space Force buying commercial space data in under three years

319 companies were selling into that marketplace as of July [6]

The lead story — what happened

Small satellites stopped being experiments. Over the past three years they became national-security systems and revenue-earning businesses, and rival governments noticed. [1]
The old worry was that one expensive satellite made one target. The answer was numbers: thousands of cheap satellites, so no single shot could matter. [1]
A panel at the Small Satellite Conference in Salt Lake City on 25 August said the sum may have flipped. Brandon Cesul of the radar-satellite firm Umbra put it plainly: by going to huge fleets, 'we may have made the job for the adversary easier'. [1]
The reason is geometry. An attacker no longer needs to track and hit one satellite. They can find the height at which a fleet flies and build something that affects everything passing through that band. [1]
The software is shared too. 'You can upload software or a patch, and it can propagate something across your whole constellation,' said Catherine Venturini of Aerospace Corp, a US non-profit that advises on space programmes. [1]
Erin Miller, who runs the Space ISAC, a non-profit that circulates warnings about attacks on satellites, said dense fleets concentrate capability as well as risk. [1]
Every satellite is also a way in. Shawn Cozzolino of Deloitte said each one is a point an intruder can attack, and told builders to check where their most important parts are made. [1]
The things the fleets lean on are shared as well: GPS, ground communications, and freely reused open-source code all sit under many operators at once. [1]
The money is still going into numbers. Private funding for small satellites reached about $11.5 billion in 2025, and roughly 16,900 satellites under 500 kilograms are expected to launch over the coming decade. [2]
And the fleets are concentrated in one pair of hands. SpaceX says it has launched more than 80% of the world's mass to orbit each year since 2023, and that Starlink now runs about three quarters of all working satellites that can move themselves. [3]
Nobody has a full picture of what is up there. SpaceX's own tracking system follows about 16,500 objects, roughly 48% of the public list kept by the US Space Force; the tracking company LeoLabs follows more than 26,000. [4][7]
The remedy the panel offered was not fewer satellites. It was faster warnings between operators, so that the first company hit becomes, as Cesul put it, 'a canary in a coal mine' for everybody else. [1]

Who is involved

Brandon Cesul

a former intelligence analyst, now at the radar-satellite company Umbra; he argued big fleets made the attacker's job easier
Erin Miller

executive director of the Space ISAC, a US non-profit that passes satellite threat warnings between companies; she said dense fleets concentrate risk as well as capability
Catherine Venturini

an engineer at Aerospace Corp, the US non-profit that advises government space programmes; she flagged fleets run with almost no human checking
SpaceX

the company that launches most of the world's cargo to orbit and owns most of the satellites in it; its Starlink fleet is the biggest single example of the bet
The US Space Force

the military branch that buys space services; it keeps the public catalogue of orbiting objects and is spending heavily on commercial data and radar

What is pushing on this

Reliance on small satellites High↑

communications, Earth photography and navigation now run on them [1]

Cost of attacking a fleet Easing↓

aim at a height, not at a spacecraft [1]

How much sits in one company's hands High↑

about three quarters of steerable satellites are Starlink's [3]

Warning between operators Building↑

sharing runs through the Space ISAC and a US military cell [1]

How it unfolded

Before a few large, costly satellites, each one worth attacking on its own [1]
Since 2023 the shift to numbers, with SpaceX carrying over 80% of the world's mass to orbit each year [3]
25 August security researchers tell the Small Satellite Conference the sums may have reversed [1]
Next decade about 16,900 more small satellites expected to launch [2]

Where this points

Watch whether buyers start asking for satellites at different heights, from different makers, running different software. Otherwise the argument gets settled by the first attack that clears a whole band of sky.

The rest of the day

38 more stories on this beat.

Each with its own sources. None of these is a link to the story above.

02
Roman telescope launches and heads for L2

NASA's Nancy Grace Roman Space Telescope lifted off at 7:26am Eastern on Sunday from Kennedy Space Center in Florida, on a SpaceX Falcon Heavy. It is on a three-month cruise to a gravitational parking spot about 1.5 million kilometres from Earth. [15][16][17]

Why it matters — It is the biggest new eye on the sky since the James Webb telescope, and it launched about nine months earlier than the date NASA had promised.
03
Its mirror was built for a spy satellite

Roman's mirrors were ground for the next generation of US spy satellites. When that project was cancelled the hardware was offered to NASA, which built an observatory around it. The Falcon Heavy's two side boosters flew themselves back to landings on the Florida coast. [18]

Why it matters — A Hubble-sized mirror that arrived free is a large part of why the telescope cost what it did.
04
A president phones a post-launch briefing

Half an hour into NASA's press conference on Sunday, administrator Jared Isaacman took a call and held up his phone. US President Donald Trump congratulated the room: 'Boy, it looked beautiful on television.' [21][22]

Why it matters — Presidents do not normally call NASA briefings, and Trump's own budget proposals had twice sought to cut this telescope. [22][19][20]
05
Roman sees wide, where others see deep

Roman's 300-megapixel camera matches Hubble's sharpness but photographs at least 100 times more sky at once. It will send back about 2,500 terabytes over five years, against Hubble's 172 terabytes in 30 years. [19][24][25]

Why it matters — It is built to survey rather than to stare, so most of its discoveries will be made later, by people reading the archive.
06
A quarter of its time on the galaxy's bulge

Roman will spend more than a quarter of its observing time watching the crowded centre of the Milky Way, looking for small rocky planets by the way their gravity briefly brightens a star behind them. [23]

Why it matters — That technique finds planets far from their stars, which the transit method used by other telescopes largely misses.
07
Mars may be two-faced all the way down

Mars's northern half is smooth lowland and its southern half stands kilometres higher, with crusts differing by about 25 kilometres. A Nature study led by Alexander Berne finds the mantle under the south is 200 to 400 degrees Celsius hotter than under the north. [37]

Why it matters — If the split reaches the interior it is original, not the scar of one giant impact, which changes where ancient Mars could have held water.
08
NASA reopens the Mars contamination question

NASA's safety office is recruiting outside scientists and engineers for a group called M-FORCE, to revise the thresholds for how much Earth life a spacecraft may carry to Mars. Its report will be published. [38]

Why it matters — Those numbers decide which places on Mars a lander is allowed to touch, and they were written before commercial Mars plans existed.
09
A galaxy with gas and no stars

Cloud 9, about 14 million light-years away, holds around a million suns' worth of hydrogen and roughly five million suns' worth of dark matter. The deepest images yet show virtually no starlight at all. Team leader Ignacio Trujillo called the emptiness the most compelling result they could have obtained. [39]

Why it matters — If confirmed it is the first galaxy that never managed to make a single star, which tests what dark matter alone can hold together.
10
Next station spacewalk set for Tuesday

Jessica Meir and Sophie Adenot will step outside the International Space Station at 7:30am Eastern on 1 September. It follows three spacewalks in August, the last of which installed a replacement high-speed antenna over six and a half hours. [26][27]

Why it matters — Four spacewalks in five weeks is a heavy repair load for a station already past its planned life.
11
A leak grounds four astronauts, still with no date

NASA and SpaceX pushed back Crew-13 after finding an oxidiser leak in the Dragon capsule's engine plumbing during routine pre-launch checks. No new launch date has been announced. [28]

Why it matters — The crew includes astronauts from the US, Canada and Russia, and the station's handover schedule moves with them.
12
Satellites navigate with no GPS at all

NASA's Starling mission, four small satellites in low orbit, worked out where it was by using other satellites as moving landmarks, with no GPS signal. The experiment has been extended to at least 2028. [45]

Why it matters — GPS is jammed routinely on Earth and does not reach the Moon, so spacecraft need another way to know where they are.
13
SpaceX gives away a collision-warning service

SpaceX opened a free platform for other satellite operators, built on star cameras aboard Starlink craft. It screens more than 500,000 orbit files a day; the US Space Force's public service checks three times a day. [4]

Why it matters — The company that owns most of the traffic is becoming the fastest source of warnings about it.
14
Space Force buys a radar in a shipping container

LeoLabs won a $20.68 million agreement from the US Space Force for a transportable version of its Scout radar, for a defence mission the company said it could not name. Its network already tracks over 26,000 objects. [7][8]

Why it matters — It moves a commercial tracking firm into selling military hardware, not just data.
15
Pentagon puts SpaceX terminals across its aircraft

The US Space Force awarded SpaceX a fleet-wide Starshield service order for military aircraft, promising at least 500 megabits per second down. The value was redacted. About $51.9 million has already gone on qualifying the terminals. [5]

Why it matters — Officials cited that spending as a reason switching to a rival would cost too much, which is how a supplier stops being replaceable.
16
A $124m bill for bought space data

A US government audit published on 27 August found the Space Force spent $123.9 million through its commercial data marketplace between January 2023 and September 2025, across 1,315 purchases. One cell in Colorado made 590 of them. [6]

Why it matters — The same audit found the military still cannot see what other parts of itself have already bought.
17
Launch worry hangs over the smallsat trade

At the Small Satellite Conference, builders had money and hardware but no confidence in rides. Two integrators, Exolaunch and SEOPS, have bought whole Falcon 9 rockets to resell seats, and a French broker signed for capacity on up to six MaiaSpace flights from 2028. [9]

Why it matters — Everything in the lead story depends on getting the copies up, and that is the one part nobody has spare.
18
A pitch for satellites that come home

Lux Aeterna, founded by a former Starlink engineer, is pitching the US military on satellites that return from orbit and fly again. Its Delphi demonstrator is due to launch in 2027. [10]

Why it matters — It is the opposite bet to disposable fleets: fewer craft, brought back and reused.
19
Canada backs a fleet that does not exist yet

Canada's government has put a $2.3 billion, 15-year contract behind Telesat's Lightspeed satellites for secure military communications across the Arctic. No Lightspeed satellite is in orbit, and full readiness is not expected until well beyond 2035. [11]

Why it matters — It is a country paying to own its own communications rather than rent someone else's.
20
A court says the contract was wrong, and lets it stand

The EU's General Court annulled the European Defence Agency's award of a 250 million euro satellite communications contract to Telespazio France, finding its bid should have been rejected. The signed framework stays in force. Airbus and Marlink get 4.32 million euros in damages. [14]

Why it matters — Winning the argument returned about 2% of the contract's value, and none of the work.
21
A satellite-to-phone venture takes the shell-company route

Singapore's Astrum Space agreed to merge with Black Spade Acquisition III, a listed shell company holding about $172.5 million in cash, valuing Astrum at roughly $1 billion. Its founder separately committed up to $168 million. [13]

Why it matters — Its first satellite, Neastar-1, is meant to connect ordinary phones directly across Asia.
22
A company that sells sunlight signs its first data-centre customer

Star Catcher agreed to beam concentrated sunlight to spacecraft run by Aethero, which plans to host data centres in orbit. Neither the amount of power nor the price was disclosed. [12]

Why it matters — Star Catcher's chief executive Andrew Rush said power, not computing, was the wall the two space-manufacturing companies he ran before kept hitting. [12]
23
Ariane 6 completes Europe's storm watch

An Ariane 6 launched the 3,800-kilogram MTG-I2 weather satellite from Kourou in French Guiana on 27 August. It completes a three-satellite set in geostationary orbit, 35,786 kilometres up, watching Europe and North Africa for fast-forming storms. [35]

Why it matters — Those are the pictures behind severe-weather warnings on two continents.
24
A booster flies for the 37th time

SpaceX flew a Falcon 9 first stage for a record 37th time on 25 August, the 100th Falcon 9 flight of 2026. The rocket flew 165 missions in 2025, more than every other orbital rocket combined, all successful. [36]

Why it matters — Two Chinese rockets landed boosters in the past six weeks; neither has flown one a second time. [36]
25
Artemis III engines go into the rocket

Technicians at Kennedy Space Center began fitting four RS-25 engines into the core of the rocket meant to carry the Artemis III crew next year. Each weighs about 3,500 kilograms and burns propellant at roughly 1,500 gallons a second. [32]

Why it matters — It is the first hardware milestone for the mission meant to put people back on the Moon.
26
NASA fires engines at fake moondust in a vacuum ball

Inside an 18-metre steel sphere at NASA Langley, engineers began the most complex test yet of what a lander's exhaust throws up off lunar soil, using an ethane jet against simulated regolith. [33]

Why it matters — Blown grit from a landing can damage the lander itself and anything else already on the surface.
27
Two small craft to practise meeting near the Moon

NASA and the Colorado company Advanced Space passed the design review for CAPSTONE 02, two small spacecraft due to launch in late 2027 to practise finding and approaching each other in lunar orbit. [34]

Why it matters — Rendezvous near the Moon is harder than near Earth, because both bodies pull on the path at once.
28
Curiosity has now climbed a kilometre

NASA's Curiosity rover has gained one kilometre of height since it started up Mount Sharp in 2014, a 5-kilometre mountain inside Gale Crater. It marked it with a 323-image panorama of a valley called Valle Grande. [47]

Why it matters — Each hundred metres of climb reaches rock laid down in a different, wetter chapter of Mars's past.
29
A moon that will never quite eclipse the Sun

Perseverance filmed Phobos, the larger of Mars's two moons, crossing the Sun. Phobos is spiralling closer to Mars, but tides are expected to tear it apart before it grows large enough in the sky to cover the Sun completely. [48]

Why it matters — Mars will never have a total solar eclipse, however long anyone waits there. [48]
30
Hubble dates the Milky Way's oldest meal

Astronomers led from Bologna used Hubble data to confirm that a dwarf galaxy merged with the Milky Way during its earliest years. The galaxy now spans about 200,000 light-years and holds some 200 billion stars. [40]

Why it matters — Big galaxies are largely made of smaller ones they absorbed, and this dates the first course.
31
Galactic centres grow as one thing, not two

A simulation led from the Leibniz Institute for Astrophysics Potsdam found that the dense star cluster at a galaxy's centre and the disc of stars around it are not separate processes, as had been assumed. [41]

Why it matters — It links how a galaxy's heart forms to how its supermassive black hole is fed.
32
Chandra publishes sixteen galaxies at once

NASA released 16 images combining decades of X-ray data from the Chandra observatory, launched in 1999, with pictures from other telescopes. They include the edge-on spiral NGC 4631, nicknamed the Whale. [42]

Why it matters — X-rays show the hot gas and dead stars that visible-light pictures leave out.
33
Planet-building is a race against a vanishing disk

Astronomers used the James Webb telescope to watch 72 young Sun-like stars and track how the gas around each one leaks away. Gas giants must finish gathering their atmospheres before the supply blows off. [43]

Why it matters — It explains why big gassy planets are rarer than small rocky ones.
34
A train ride turned into a dark-matter clue

David Hendel, a former astronomer, was scrolling an astronomy paper on a New York commuter train in 2023. In an old Hubble image he spotted a faint ribbon of stars trailing a dim galaxy 115 million light-years away. [44]

Why it matters — The shape of such ribbons is one of the few ways to read how dark matter is arranged.
35
Eyelids drift upward in weightlessness

Researchers in Australia, Germany and New Zealand measured 115 NASA photographs of 13 astronauts and found the lower eyelid rises in microgravity, sometimes far enough to cover part of the cornea. [29]

Why it matters — Eyesight is already one of the clearest things long spaceflight changes, and this is a new piece of it.
36
A satellite catches plants pausing at midday

NASA's ECOSTRESS heat sensor on the International Space Station mapped a worldwide midday dip in the water plants release. Drought and heat shift each day's peak earlier, typically by half an hour to an hour and a half. [46]

Why it matters — Coarser satellite and weather datasets miss the dip entirely, so anything built on them overstates how much water plants move at noon.
37
A near-total lunar eclipse, seen from half the planet

Earth's shadow darkened 96% of the full Moon overnight on 27-28 August. Every phase happened at the same moment for everyone on the night side of the planet. [49]

Why it matters — Unlike a solar eclipse, a lunar one needs no narrow path: half the world sees the identical event.
38
Medals, and an academy that does not exist yet

The Artemis II crew received the Congressional Space Medal of Honor on 28 August, the first awards since 2023, for a flight that took them 406,800 kilometres from Earth. The same day an executive order started work on a US Space Academy, with no site chosen and a report due within 120 days. [50][31][30]

Why it matters — The awards are for a flight already completed; the school is a plan for a workforce shortage that is here now. [2]
39
Europe's first launcher contracts land

The European Space Agency signed the first three European Launcher Challenge contracts on 27 August, worth 543.6 million euros between Isar Aerospace, PLD Space and Rocket Factory Augsburg. None of the three rockets has reached orbit. [51]

Why it matters — Europe is paying to have more than one way off the ground before it needs one.

02 Lesson why it matters

Spreading out only protects you along the line you spread

Many copies survive a threat that arrives one at a time. They do not survive one shaped like the thing they all have in common.

The twist

Copies protect you against a threat that has to pick them off one at a time. Against a threat aimed at what the copies share, ten thousand of them are one.

How it works

One costly satellite is one target
So build thousands of cheap ones instead
Cheap means identical: one altitude, one supplier, one software update
A weapon aimed at what they share reaches all of them
The spreading was real. It just ran along the wrong line

Where you've seen this

Banana farms

nearly every banana sold is one variety, so one fungus can take the whole crop

Office computers

a thousand identical laptops updated from one server all break on the same bad patch

Savings

a dozen different funds can quietly hold the same handful of shares

Wind farms

turbines spread across a whole country still stop together on a windless day

The catch

Spreading out still works against accidents, which really do arrive one at a time. The mistake is counting that as protection against something that chooses where to aim.

And the whole of it

Nobody in this story was careless. More satellites really is harder to attack one by one, and every buyer who paid for numbers got numbers. What no single buyer can see from their own desk is how much their satellites have in common with everyone else's: the same few heights, the same suppliers, the same rocket. Most of us are somewhere in an arrangement like that, counting our copies and never the thing underneath all of them.

03 Truth what's really going on

What is really going on

An industry that answered the risk of being attacked by buying more satellites has been told by its own security researchers that the extra satellites share the few things that could take them all out at once. [1]

Why it works on us — The word doing the work is resilience, which sounds like a property the system has rather than what it really is: a claim about one particular kind of attack, the kind that has to pick its victims one at a time.

Who gains

SpaceX — The US military extended its Starshield aircraft contract without a contest, citing the $51.9 million already spent qualifying its terminals as a reason a rival would cost more. Money already spent is now the argument against replacing it. [5]
Companies that track orbits — Every satellite launched makes a tracking network worth more. LeoLabs turned its $20.68 million award into a route out of selling data and into selling defence hardware. [7][8]
Rocket resellers — Exolaunch and SEOPS bought whole Falcon 9 flights and sell the seats, and the shortage that worried everyone at the conference is exactly what makes those seats valuable. [9]
SpaceX again, on the safety side — Giving its collision-warning platform away free makes SpaceX's own catalogue the list other operators check against, at no charge to them and no competition for it. [4]

Who pays

Small satellite operators — Each spacecraft is a way in for an intruder, and the cheapest fleets have the least money for security on any of them. [1]
Buyers who paid for numbers — Governments and companies bought many satellites to be hard to attack, and got copies that share an altitude, a supplier and a software update channel. [1]
Airbus and Marlink — The EU's General Court agreed their bid should have won a 250 million euro contract, then left the signed deal with Telespazio in force. They received 4.32 million euros instead of the work. [14]
Rival satellite terminal makers — The US Space Force said switching supplier would duplicate costs it had already paid, so competition for that fleet is closed by spending, not by a test. [5]
The Crew-13 astronauts — A leak found during pre-launch checks grounded them with no replacement date, and the station's crew handover moves with them. [28]

What nobody knows yet

Open questions from across today’s stories — ours included.

01

Whether a weapon that could affect a whole band of orbit actually exists.

The claim rests on what Brandon Cesul of Umbra called rumours of a Russian nuclear anti-satellite weapon, plus wide-area jamming. No government has published evidence, and the panel offered none. [1]
02

How much of the sky anyone can actually see.

SpaceX's tracking system follows about 16,500 objects and cannot detect anything much under a metre; LeoLabs follows more than 26,000; the US Space Force's public list is larger than either. Nobody has published a combined figure. [4][7]
03

How wide Roman's view really is, and what it cost.

Two comparisons are in circulation: Payload and the BBC report a field at least 100 times Hubble's, while Space.com reports 50 times the width of the James Webb telescope's. The Guardian and Spaceflight Now put the cost at $4.3 billion; Space.com writes nearly $4 billion over almost two decades. [16][17][19][24]
04

What the Starshield aviation deal is worth.

The US Space Force redacted the contract value, and the numbers of terminals already fitted to aircraft are obscured in the filing. Only the $51.9 million already spent qualifying the hardware is public. [5]
05

What LeoLabs' new radar is for.

The company said it could not disclose the programme or the test the $20.68 million mobile radar would support. [7][8]
06

Why the Crew-13 capsule leaked, and when four astronauts fly.

NASA has said only that an oxidiser leak turned up in Dragon's engine plumbing during routine checks. No cause and no new launch date have been given. [28]
07

Whether Mars is split all the way to its core.

The 200 to 400 degree difference between the two hemispheres' mantles is read from seismic data collected at a single landing site, so one spot is standing in for a planet. [37]
08

Whether Cloud 9 is a starless galaxy or only a very faint one.

The deepest images yet taken found nothing where a million suns' worth of gas sits, which is evidence of absence at one depth, not proof that no star exists. [39]

04 Hope carry this

The main mirror inside the telescope that launched on Sunday was ground for a spy satellite that was cancelled before it ever flew. It is now on a three-month cruise to a point 1.5 million kilometres from Earth, where it will measure the light of a billion galaxies.