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Damola
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Damola
@da_moxy
Data and Artificial Intelligence
United Kingdom Katılım Ocak 2013
14K Takip Edilen23.2K Takipçiler
Damola retweetledi
Damola retweetledi

Damola retweetledi

Artemis II is crazy when you realize one tiny miscalculation = you’re not “a bit off”… you’re lost in space forever.
Damola@da_moxy
Our world would have been so boring without Maths and Physics #ArtemisII
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@RyanRosenblatt Everyone who watched the mission with us is the coolest!
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Damola retweetledi

if you beat Man City e no go better for u.
Fabrizio Romano@FabrizioRomano
🚨 Liam Rosenior: “Of course, we can beat Man City”.
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Would be nice to see the crew whilst inside the spacecraft at the moment #ArtemisII
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Our world would have been so boring without Maths and Physics #ArtemisII
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Damola retweetledi

Behind the four astronauts of Artemis II are hundreds of people tracking their every move: monitoring spacecraft systems, evaluating crew safety, and staying in constant communication. Let’s hear it for the team in Mission Control responsible for getting the astronauts around the Moon and safely home.


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Damola retweetledi

Your last flight hit maybe 600 mph. Tonight four astronauts hit Earth's atmosphere at 25,000 mph. Forty times faster. NASA needs them at 17 mph by the time they touch water off San Diego. The engineering behind that slowdown is one of the best stories I've come across.
It comes down to one piece of hardware: a 16.5-foot shield bolted to the bottom of the capsule, made of 186 blocks of a heat-absorbing coating called Avcoat on a titanium frame. When the capsule hits atmosphere, those blocks burn away on purpose, carrying heat with them so the crew sits at 75°F inside while the outside hits 5,000°F, roughly half the temperature of the sun's surface. And there is no backup for this system. NASA builds redundancy into everything else on the spacecraft. Not the shield.
I have to tell you what happened last time because it makes tonight way more interesting. In 2022, NASA flew this exact shield on an uncrewed test called Artemis I. When the capsule came back, chunks had cracked off in over 100 spots. Way worse than any computer model predicted. Took two years and over 100 lab tests to pin down why.
The answer is sort of beautiful in a nerdy way. During that 2022 reentry, the capsule did a "skip," dipping into the atmosphere, bouncing back out into space, then diving in again. The problem was the bounce. When the capsule floated back out, the outside cooled, but the inside of the shield was still scorching. Gases trapped in the coating had nowhere to go because the cooled outer layer sealed shut. Pressure built. Cracks formed. Pieces blew off. Apollo engineers in the 1960s were aware of this exact gas-venting issue. But when NASA remade the coating for Orion decades later, they accidentally made it less breathable.
The fix for tonight is my favorite part. They kept the same shield; it was already bolted on, and swapping it would've added 18 months. Instead of changing hardware, engineers changed the flight path. Tonight's capsule does a shorter, shallower bounce, keeping steady heat on the shield so gases can escape properly. Same shield. Different math.
One detail from a January safety review gave me real confidence. Engineers modeled total shield failure, coating stripped clean off. The titanium frame underneath could still protect the crew on its own. A physics professor at Northeastern said she'd personally feel safe riding in it because with a system this simple, there are only so many things that can go wrong.
By tonight, these four people will have gone 252,756 miles from Earth, farther than any human ever, beating Apollo 13 by over 4,000 miles, at the fastest speed a human has ever moved. And the moment the capsule hits the Pacific, a diver will swim underneath and photograph the shield, giving NASA its first real proof of whether the new math worked.
NASA@NASA
They're halfway home. The Artemis II astronauts have hit the "halfway" mark between the Moon and the Earth. They will splash down in the Pacific Ocean around 8:07 pm ET on Friday, April 10 (0007 UTC on Saturday, April 11), off the coast of San Diego.
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