Today is a day for mourning and remembering.
We will never forget them, nor the last time we saw them this morning as they prepared for their journey and waved goodbye.
Millions tuned in that morning expecting to watch history.
What they saw instead was a spacecraft coming apart 73 seconds after lift-off.
But what if the seven people on board survived that moment and were alive during the fall? What if engineers had warned NASA the night before? And NASA flew anyway.
What if a piece of Challenger was lying on the Atlantic floor waiting decades to be stumbled onto? This isn’t the version they taught you in school.
These are 12 things you didn’t know about the Challenger disaster.
Once you’ve heard them, you won’t look at that footage the same way again.
Let’s begin.
I’m Ambrose Wilde and the strangest part of this story is how much of it was sitting in plain sight the whole time.
The warnings were put in writing.
The numbers from the cabin were measured and published.
Even the wreckage on the sea floor had been sitting there waiting.
And the first of these 12 goes all the way back to a budget fight in Washington.
Number one, the boosters were picked because they were cheaper to build.
By the early 1970s, the Apollo program was winding down and Washington had lost its appetite for moon money.
In March 1970, President Richard Nixon made it clear NASA wasn’t getting anything close to Apollo funding again.
And the bigger dreams, like a space station, were put on hold until a shuttle existed.
What NASA could still sell was a reusable spacecraft, a vehicle that would fly up, come home, get turned around and fly again, more like an airliner than a rocket.
Even that had to shrink.
An earlier design with a winged booster that flew itself back to the runway carried an estimated price of 10 to 13 billion dollars and Congress and the White House Budget Office didn’t like it.
So, in March 1972, NASA settled on the shape everybody recognizes today, a winged orbiter, a giant fuel tank that got thrown away on every flight, and two solid rocket boosters strapped to the sides.
NASA put the cost of developing that version at about $6.
2 billion, roughly half the earlier plan.
The boosters were a big part of the savings.
NASA had looked at liquid-fueled boosters, which might have been cheaper to run over the long haul, but solid boosters cost less to develop up front, and according to the presidential commission that later investigated Challenger, that was the overriding reason they won.
That choice came with a catch the engineers understood perfectly well.
A liquid engine can be throttled back or shut down if something goes wrong.
A solid rocket can’t.
Once it’s lit, it burns until the propellant runs out, and anyone sitting on top of it is committed for the whole ride.
There was no switch on the flight deck that could stop the boosters, and no way to abort while they were firing.
That’s not a typo, by the way.
For the first stage of every shuttle flight, the crew was riding a pair of rockets that nobody on Earth could turn off.
In August 1972, the contract to build them went to Thiokol, a rocket company with a plant in Utah.
And the way those boosters had to be built and shipped is where the real flaw crept in.
Number two.
The boosters were built in pieces, and the pieces were the problem.
A finished booster was nearly 116 ft long and about 12 ft wide, far too big to haul across the country in one go.
So, each motor case was made from 11 steel sections, joined at the factory into four large segments, loaded onto rail cars at Thiokol’s Wasatch plant near Brigham City, Utah, and ship to Florida.
At the Kennedy Space Center, crews stacked those segments and joined them together.
Those connections were called field joints, and each one was sealed by a pair of rubber rings running all the way around the rocket.
Those were the O-rings.
The idea behind them was simple enough.
When the booster ignited, pressure from inside would shove the rubber into the gap and seal it before the hot gas could find a way out.
The second ring was there in case the first one failed.
But, the joint didn’t behave the way the drawing said it would.
In a 1977 test, the joint flexed open under pressure by as much as 52 thousandths of an inch.
On a rubber seal, a gap like that mattered, because it was widening at the exact moment the rings were supposed to close it.
NASA engineers suggested a fix with small metal spacers called shims, and the record shows they got no response.
In 1980, a request to test the joint across a range of temperatures down to 40° was turned down.
Then, in December 1982, the paperwork changed.
The second ring was no longer treated as a backup you could count on.
And the field joint ended up labeled criticality one, NASA’s term for a part whose failure could cost the vehicle and the crew.
That label is about as serious as it gets, and the shuttles kept flying anyway.
Number three.
The shuttle was supposed to fly about twice a month to justify the cost.
NASA sold the shuttle as the vehicle America would use for nearly everything: science missions, commercial satellites, and military payloads, too.
The Air Force bought in.
It poured more than $4 billion into rebuilding a launch site at Vandenberg Air Force Base in California, a complex nicknamed Slick Six, so the shuttle could carry high-priority military satellites into polar orbits that Florida couldn’t reach.
The first shuttle flight from that pad was set for the 15th of October, 1986, aboard Discovery with Robert Crippen in command.
It never flew.
Then there was the pace.
In 1985, NASA was projecting 24 flights a year by 1990.
That year, it actually managed nine.
For 1986, it scheduled 15, and the presidential commission concluded the agency almost certainly couldn’t have flown them all.
The strain was already showing.
The spare parts system had been planned around a dozen flights a year, and a year after the parts should have been on the shelf, only 32,000 of the 50,000 items needed had shown up.
To get Challenger ready for this mission, technicians took 45 of the roughly 300 parts it needed from other orbiters.
Astronauts were getting less simulator time than planned because the two shuttle simulators could only support 12 to 15 flights a year.
One manager told the commission that safety concerns didn’t carry much weight because the political side of these decisions was so overwhelming.
So, yeah, not great.
Every launch that went off without a problem made the next deadline feel a little more normal, and that pressure rode along on every flight, including this one.
Back in 1982, NASA’s administrator, James Beggs, had said the top priority was to turn the shuttle into an operational system.
By the time Challenger was being readied, operational had come to mean flying on schedule.
Number four.
A huge piece of Challenger was found by accident in 2022.
Picture a dive team off the Space Coast of Florida filming for a History Channel documentary about the Bermuda Triangle.
The underwater explorer Mike Barnett was leading them, and they were hunting for something else entirely, the wreck of a Navy rescue plane, a PBM Mariner that vanished in December 1945 while searching for the missing bombers of Flight 19.
On scout dives in March 2022, the team came across a big, modern-looking object lying in the sand covered in square tiles.
The former astronaut Bruce Melnick looked at the footage and had a strong suspicion.
In August, NASA’s Mike Cienili confirmed it.
This was a section of the space shuttle Challenger, about 20 ft long and still partly buried, identified by its modern construction and its 8-in square heat shield tiles.
Think about where it had been all that time.
After the disaster, the recovery fleet spent months hauling wreckage off the bottom and almost all of it was lowered into two old missile silos at Cape Canaveral, each 78 ft deep, that had once held Minuteman missiles.
Pieces kept washing up on beaches in the years after that and were added to those silos, too.
But this section sat on the seafloor for 36 years, not far off the coast, and nobody knew.
When NASA announced the find on the 10th of November 2022, administrator Bill Nelson said the tragedy would forever be seared in the collective memory of the country.
The History Channel aired the discovery 12 days after NASA’s announcement.
Every piece of Challenger debris belongs to the federal government and NASA said it was weighing its options with the crew and their families in mind.
So far, the section has stayed right where the divers found it, which leaves an obvious question.
If a piece that size could lie there unnoticed for nearly four decades, what else from that morning is still out in the Atlantic? Nobody can say for sure.
Number five.
In 2024, Christa McAuliffe became the first woman with a statue at the New Hampshire State House.
McAuliffe taught social studies at Concord High School and in July 1985, she was picked from more than 11,000 applicants to be the first teacher in space.
She’d planned to teach two lessons from orbit including a tour of the spacecraft she called the ultimate field trip.
She was the reason schools all over America wheeled TV sets into classrooms that January morning.
On the 2nd of September 2024, which would have been her 76th birthday, a bronze statue of her was unveiled outside the State House in Concord.
It stands about 8 ft tall, larger than life, and shows her smiling and striding forward in her NASA flight suit, the way she looked walking out to the launch pad.
The sculptor, Benjamin Victor, modeled the suit on one worn by Barbara Morgan, her backup for the mission, and worked from archival footage and interviews to get her face right.
It sits on a 20,000-lb granite base that carries the line she became known for.
“I touch the future.
I teach”.
It’s the first statue of a woman on those grounds and the first new statue added there in more than 100 years.
Governor Chris Sununu, who proposed the monument, spoke at the ceremony.
And so did NASA’s Deputy Administrator Pam Melroy, who called it a beacon of inspiration for future generations and wished McAuliffe a happy birthday.
There’s something hard to sit with in that statue, though.
It honors a teacher whose biggest lesson was supposed to come from orbit and the reasons she never got to give it were known to a handful of engineers long before she climbed aboard.
Some of the people closest to those reasons worked at one NASA center in Alabama.
And in early 2025, the man who ran it died.
Number six.
The man in charge of NASA’s booster center lived to 102.
William Lucas was born in Newbern, Tennessee in 1922 and he directed the Marshall Space Flight Center in Huntsville, Alabama from June 1974 until July 1986.
Marshall handled the shuttle’s propulsion, including the solid rocket boosters, which put Lucas right at the center of the Challenger story.
He retired that July after strong criticism from the presidential commission.
Accounts of how Marshall worked under him aren’t flattering.
Roger Boisjoly, a Thiokol engineer you’ll meet properly in a few minutes, later said Lucas had his people scared to death because he could crush their career in a heartbeat.
The journalist Malcolm McConnell went further in his book Challenger: A Major Malfunction.
He wrote that key people at Marshall, Lucas among them, knew about a potentially catastrophic flaw in the booster joint as early as 1977, and that Lucas told managers not to raise Marshall issues that could delay a launch.
Those are claims from one engineer and one author, and they’re part of a long argument rather than a court ruling.
But, they help explain why bad news about the boosters had such a hard time traveling up the chain.
Lucas died at his home in Huntsville on the 10th of February 2025 at the age of 102.
He gave few interviews about Challenger in his later years, and his death brought the old questions back for a little while about who knew what and whether the people at the top should have carried more of the blame.
There’s something else that resurfaces every time Challenger comes back into the news, too.
It’s a detail about the crew’s final minutes that most people still haven’t heard, and it’s why this list ends where it does.
Number seven, a 2024 book reopened the whole story, including the question of the White House.
In May 2024, the journalist Adam Higginbotham published Challenger: A True Story of Heroism and Disaster on the edge of space, A 576-page account built from records, interviews, and transcripts.
The launch itself doesn’t arrive until well past the middle of the book.
Higginbotham spends that time on the program that produced it, bookended by the Apollo launchpad fire in 1967 and the loss of Columbia in 2003.
And he lays out warning signs that were overlooked or outright ignored year after year.
His conclusion is blunt.
The nation’s smartest minds, he writes, had unwittingly sent seven men and women to their deaths.
The word doing the work there is unwittingly.
Nobody in this story wanted a disaster, and that’s part of why the oldest rumor about Challenger refuses to die.
On the evening of the launch, President Ronald Reagan was due to deliver the State of the Union.
And for years, people have claimed the White House leaned on NASA to get the teacher into orbit in time for the speech.
Democrats later pointed at White House officials, including Chief of Staff Donald Regan and Pat Buchanan.
The record tells a plainer story.
The White House released the original draft of the speech in March 1986.
It mentioned an X-ray experiment flying on Challenger, but it didn’t talk about the launch.
A White House report that April concluded there had been no pressure.
And the presidential commission, which Reagan set up on February 6th and which published its report that June, said everyone who played a key role in the launch decision testified under oath that there was no outside pressure, and it found no evidence of any.
When Reagan finally gave the postponed address on February 4, he described that experiment as launched and lost.
So, the pressure didn’t come from the Oval Office.
As far as the record shows, it came from somewhere much closer to the launchpad, and it had been building for years.
Number eight.
The O-rings have been failing for years and every safe landing made it look acceptable.
The first sign showed up on the second shuttle flight ever in November 1981 when inspectors found erosion on an O-ring in the right booster.
Hot gas had been eating into the rubber.
In August 1984, after a flight of Discovery, they found soot between the first and second rings in the left booster which meant hot gas had gotten past the first seal.
Then came January 1985.
Mission 51-C launched on the coldest morning of any shuttle flight up to that point with the air at 62° and the O-rings calculated at about 53.
Both boosters came back with erosion on the primary O-ring and Thiokol’s engineers tied the damage to the cold which made the rubber less flexible.
Through 1985, erosion turned up on every flight except one.
On one mission, both the first ring and the backup had eroded.
Pay attention to this next part because it explains everything that happened later.
Each one of those flights landed safely.
So, each time the damage got reviewed, discussed, and written up as something the system could live with.
The sociologist Diane Vaughan spent about 10 years studying this and in her 1996 book, The Challenger Launch Decision, she gave it a name.
The normalization of deviance.
Something goes wrong, the mission succeeds anyway, and the problem slowly becomes an expected, tolerable part of how things work.
What makes her account unsettling is that she didn’t find villains.
She found people following the normal rules of their organization through formal flight readiness reviews reaching conclusions that looked reasonable at every step.
In her telling, the mistake came out of ordinary working life at NASA.
The presidential commission saw the same pattern from a different angle.
On February 11, at a televised hearing, the physicist Richard Feynman dropped a piece of O-ring rubber into a glass of ice water and showed how it lost its spring.
He felt strongly enough about the agency’s view of risk that he threatened to keep his name off the final report unless his own observations were included, and they went in as an appendix.
But years before any of that, at least one engineer flatly refused to treat any of it as normal.
Number nine.
Six months before the disaster, an engineer put loss of human life in writing.
Roger Boisjoly was an engineer at Thiokol who worked on the booster seals.
After looking at the hardware from that cold January 1985 flight, he’d seen what the temperature had done, with the first ring failing completely and the second one damaged.
It frightened him.
On the 31st of July, 1985, he sent a memo to Robert Lund, Thiokol’s vice president of engineering, copied to several colleagues, including Allan McDonald, the director of the booster motor project.
In it, he warned that if the same thing happened in a field joint, success or failure would come down to what he called a jump ball.
Then came the line he’s remembered for.
The result would be a catastrophe of the highest order, loss of human life.
He wrote that in the summer of 1985, half a year before Challenger flew.
He also asked for something concrete.
An unofficial team had started looking at the joint on July 19, and Boisjoly wanted that team officially given the responsibility and the authority to do the work, assigned full-time, with the field joint as the number one priority.
You’d think a warning like that would ground the fleet.
It didn’t.
No shuttle was grounded, and the flights went on one after another through the rest of 1985.
Boisjoly and McDonald kept pushing inside the company.
It would cost Boisjoly dearly.
After the disaster, he said Thiokol took him off space work and that colleagues shut him out.
He went on to run his own forensic engineering firm and to lecture on engineering ethics.
He received the AAAS Award for Scientific Freedom and Responsibility in 1988, and he died in Utah in January 2012.
And in January 1986, with a cold front sliding down over Florida, the two of them would get one last chance to stop a launch.
Number 10.
The engineers said no the night before, and the answer got changed.
On the evening of the 27th of January 1986, with a hard freeze in the forecast, a three-way teleconference linked Thiokol in Utah, NASA’s Marshall Center in Alabama, and the Kennedy Space Center in Florida.
Thiokol’s engineers made their case with charts.
They had no data showing the O-rings would seal below 53°, the coldest launch on record, and Lund and Thiokol’s Joe Kilminster recommended against launching until it was warmer than that.
NASA’s booster project manager, Lawrence Mulloy, rejected the analysis and asked whether they expected him to wait until April.
Thiokol asked for a break to talk among themselves.
During that recess, according to accounts of the meeting, senior vice president Jerry Mason told Lund it was time to take off his engineering hat and put on his management hat.
When the call came back, Thiokol’s management had reversed itself.
The data, they now said, was inconclusive, and they recommended going ahead.
McDonald, who was at Kennedy, refused to sign the launch recommendation.
He later said he didn’t want to stand in front of a board of inquiry if anything went wrong.
So, Kilminster signed it in Utah and faxed it over.
Mulloy then called Arnold Aldrich, who led NASA’s mission management team, and they agreed to proceed.
According to the record, the O-ring argument never came up on that call.
McDonald paid for that refusal later after he told the presidential commission his side of the story, interrupting NASA officials to do it.
Thiokol effectively demoted him, and it took a congressional resolution threatening the company’s federal contracts to reverse it.
He ended up as Thiokol’s vice president of engineering, redesigning the very motors he’d warned about.
That wasn’t the only cold weather worry.
Engineers from Rockwell, the company that built the orbiter, were afraid that ice on the launch tower could break off and damage the shuttle.
And Aldrich decided to go ahead after talking it over with engineers at Kennedy in Houston.
Overnight, an ice team out on the pad took temperature readings on the boosters.
The left one read 25°, the right one read eight.
Those numbers went down as engineering data rather than launch rules, so they didn’t stop a thing.
At 11:38 the next morning, with the air at 36°, Challenger lifted off with seven people on board, and what they went through over the next few minutes is the part investigators took the longest to piece together.
Number 11.
The leak started before Challenger even cleared the tower.
Less than a second after the boosters lit, cameras caught a puff of dark gray smoke on the right booster close to the strut that tied it to the external tank.
Over the next few seconds, there were nine of them.
That was the cold joint failing to seal, hot gas getting out exactly where the engineers had feared it would.
And and the smoke stopped.
Burned material from the propellant had jammed itself into the gap, a makeshift plug that held for a while by pure luck.
The crew had no idea.
Neither did anyone watching.
Challenger climbed and rolled out over the Atlantic.
Around 37 seconds in, it flew through wind shear, still inside its design limits.
About 20 seconds after that, the plug gave way.
At about 58 seconds, a plume of flame showed up at that joint just before the point of maximum aerodynamic pressure.
The flame was pointed at the external tank.
Within about 6 seconds, the liquid hydrogen tank had sprung a leak and its pressure started to drop.
At 68 seconds, the capsule communicator in Houston, astronaut Richard Covey, told the crew they would go at throttle up.
Commander Dick Scobee answered, “Roger.
Go at throttle up”.
That was the last transmission anyone on the ground received from Challenger.
4 seconds later, the right booster broke free of its lower strut.
And on the cockpit recorder, the pilot, Michael Smith, said, “Uh-oh”.
At 73 seconds, nearly 9 mi up and traveling at almost twice the speed of sound, the bottom of the hydrogen tank tore away.
Its contents ignited and the whole stack came apart.
Here’s the detail that everyone missed at the time.
Challenger didn’t blow up like a bomb.
A massive cloud of escaping propellant burned in the air and the orbiter was ripped apart by the forces around it.
The two boosters didn’t stop because they couldn’t.
They kept flying on their own, unguided, until the range safety system destroyed them at 110 seconds.
In Houston, the screens froze.
And over the public commentary line, NASA’s public affairs officer, Steve Nesbitt, said the words, “People still {quote} obviously a major malfunction.
We have no downlink number 12”.
The crew survived the breakup and some of them were aware of what was happening.
The crew cabin was the strongest part of the orbiter, a reinforced aluminum compartment, and it came out of that cloud in one piece.
NASA’s review estimated the crew felt somewhere between 12 and 20 times the force of gravity at the breakup for a very short moment, and it called those forces survivable.
Within 2 seconds, the load dropped below 4G and within 10, the cabin was in freefall.
But it was still going up.
It coasted for about 25 seconds, topped out near 65,000 ft, and then it started down.
For almost a minute, it stayed at or above 48,000 ft with no oxygen supply.
It took about 2 minutes and 45 seconds to reach the ocean.
Count that out sometime.
It’s a very long time to fall.
The cabin hit the water at around 207 mph with a force of about 200G, and nothing on board could survive that.
On the 28th of July, 1986, NASA released a report by Joseph Kerwin on the crew’s deaths.
The cause of death of the Challenger astronauts, he wrote, “could not be positively determined.
The crew possibly, but not certainly, lost consciousness in the seconds after the breakup if the cabin lost pressure and the wreckage couldn’t show whether it had.
Then there were the air packs.
The cabin carried personal egress air packs, small emergency air supplies meant for getting out of a smoke-filled shuttle on the ground.
Investigators recovered four.
Three had been switched on.
The one that hadn’t been activated was Scobee’s.
One that had was Smith’s.
And investigators think Judith Resnik or Ellison Onizuka, seated behind him, turned it on for him.
And then there were the switches.
Several electrical switches on Smith’s right-hand panel had been moved out of their launch positions, pushed past the lever locks that hold them in place.
Tests showed neither the breakup nor the ocean impact could have done that.
The likeliest explanation is that Smith was trying to get power back to the cockpit.
That’s what really happened in Challenger’s last minutes.
Seven people inside a falling cabin and at least some of them still working the problem the way they’d been trained to all the way down.
That night Reagan told the country it would never forget the last time it saw them waving goodbye on their way to the pad.
40 years later, the part that’s hardest to accept is how much of what followed was already written down in a memo, on a set of charts, in a thermometer reading of 8° on the right booster.
I’m Ambrose Weild.
And if you want more of the stories hiding behind history’s most famous footage, stick around because there are more videos like this one on the way.
