David Ramirez

IT-profi, Photographer, love classical music, coffee, hot chocolate, ice cream, rockets & roller coasters.

[Rocketry @SpaceNews92]

The secret to keeping Starship from ripping itself apart at 7,000+ MPH? It’s all about the "deep freeze." When SpaceX's Raptor engines ignite, they gulp down thousands of gallons of propellant every single second. At that insane flow rate, regular fuel would actually start to boil from the drop in pressure, creating deadly vapor bubbles—a phenomenon called cavitation. Think of it like microscopic pipe bombs violently imploding inside the fuel pumps, capable of shredding metal in seconds.

By super-chilling the liquid oxygen and methane into a "sub-cooled," hyper-dense state, SpaceX drastically lowers the vapor pressure. Paired with a precision-engineered tank geometry that keeps the fluid perfectly packed, the propellant behaves like a rock-solid column of liquid under massive G-forces. No boiling, no bubbles, no cavitation—just pure, uninterrupted high-thrust power tearing through the upper atmosphere.

#Starship #SpaceX #RocketScience #RaptorEngine #AerospaceEngineering #SciTech #HowItWorks #SpaceExploration

[Muy.Mona/🇪🇸💚 @Capitana_espana]

Así nació una de las campañas publicitarias más bonitas del mundo.

[Physics & Astronomy Zone @zone_astronomy]

🚨 Imagine looking up at the sky and seeing a brand-new star so bright it was visible in broad daylight.

That's exactly what happened in 1054.

Skywatchers across the world witnessed one of the most spectacular stellar explosions in recorded history. A brilliant point of light suddenly appeared in the constellation Taurus, shining so intensely that it remained visible during the day for 23 consecutive days. Ancient Chinese astronomers carefully documented the event, and the mysterious object continued glowing in the night sky for nearly two years before fading away.

💥 What people thought was a "new star" was actually a supernova—the explosive death of a massive star located about 6,500 light-years from Earth.

In a single, powerful moment, the dying star blasted its outer layers into space, releasing an incredible amount of energy and creating a vast, expanding cloud of glowing gas and dust.

🌌 Nearly 1,000 years later, we can still see the aftermath of that explosion. Today it's known as the Crab Nebula.

At its heart is a rapidly spinning pulsar—the incredibly dense core left behind after the explosion. It's a remarkable reminder that an event witnessed by people nearly a millennium ago is still unfolding in the cosmos today.

[Jeferson Nasa @Jefersonnasa_]

Los cardos rodantes comienzan su vida como pequeñas y humildes plántulas. Con la llegada del verano, la planta crece rápidamente y adopta una forma redonda y compacta. En esta etapa desarrollan hermosas flores y luego frutos.

Cuando llega el otoño, la planta se seca por completo, se desprende de sus raíces y se transforma en un esqueleto ligero que el viento arrastra a través de la llanura. De esta manera, rodando sin control, esparce sus semillas por vastas distancias.

[Science Simplified @Scivf4]

This is what a hydropower relief valve test can look like. During tests like these, massive volumes of water are intentionally released to verify that critical equipment can safely handle sudden change in pressure and flow.

[Stellarix @Stellarixorine]

This is what a Starship V3 looks like as it travels along the road… It's gigantic! A scene straight out of a movie: SpaceX's Starship V3 being transported by road to its next destination in Starling.

[Tansu Yegen @TansuYegen]

Never gamble with a magician. 🎩

[루시퍼 @lucifer5670]

신기한착시

원의위치는 그대로임

[Trump Girl 🇺🇲🦅🇺🇲 @MAGA__Patriot]

I had no idea..

"This man was born in 1809.
In 1816, at age 7, he was forced to work because his family was expelled.
In 1818, he lost his mother.
In 1828, he lost his sister.
In 1831, he opened his first business and went bankrupt.
In 1832, he stood in the legislative elections and lost.
In 1833, he borrowed money to open another business and went bankrupt again.
In 1835, he met a wonderful woman. He falls in love with her, they get engaged, and she dies.
In 1836, he entered a dark period of his life: deep depression.
He remains bedridden for 6 consecutive months. But he gets up.
He gets up and in that same year of 1836 he runs in the legislative elections and loses again.
In 1840 he presented himself as an elector; he loses.
In 1842, he met the woman he would end his life with.
They fall in love, get engaged, get married and she gives him 4 children and they lose 3 (three).
In 1843, he appeared at the congresses and lost.
In 1845, he appeared again at the congresses and lost again.
In 1850, his son died.
In 1854, he ran for the Senate and lost.
In 1856, he ran for Vice President, he didn't even have 100 votes.
In '58, he ran again for the Senate and lost again.

And in 1860 ABRAHAM LINCOLN was elected President of the United States of America 🇺🇸.
He was elected for two exceptional terms (he was assassinated in beginning of the second term.) He was one of the most respected and impactful Presidents in the history of the United States 🇺🇸.

It's important to tell this story of perseverance because we see the hero, but we don't see the backstage of the afflictions. "

Wow. ...
I think this is a great example of Never Never Never Give Up! 🇺🇸🇺🇸

[Brian Roemmele @BrianRoemmele]

In 1942 this was more than a song and more than a dance.

It was a shared experience and mood.

[Tansu Yegen @TansuYegen]

If you make it look easy, people assume it is easy.

[Royally Sage @sage1411]

My brother posts this every year in the family chat on the 4th. Still hilarious.

[Massimo @Rainmaker1973]

They are not moving, your brain is tricking you

[🎞️ jagarikin]

[Tansu Yegen @TansuYegen]

The world’s most common animals aren’t what you think 🐜

[HOW THINGS WORK @HowThingsWork_]

How participants make a sharp turn during a traditional dragon boat race in china.

[Amazing Physics @amazing_physics]

😃Physics and art make for a powerful combination

[Historic Vids @historyinmemes]

How giraffe coat patterns differ across Africa.

Not all giraffes have the same coat pattern. Across Africa, different populations developed distinct markings that often reveal where they come from. Reticulated giraffes have large geometric patches outlined by bright white lines, while Masai giraffes are known for their irregular, jagged spots. Other populations, including Rothschild’s, Angolan, West African, and South African giraffes, each have their own recognizable pattern.

These differences evolved over thousands of years as geography limited contact between populations. Rivers, deserts, forests, and vast distances allowed giraffes to develop unique appearances through genetics and natural selection. While no two giraffes share the exact same pattern, each population has a distinctive regional style. Modern genetic research even suggests that giraffes may represent several separate species rather than a single one.

[Stellarix @Stellarixorine]

At NASA’s Kennedy Space Center in Florida offload the second of four RS-25 SLS for Artemis III. From flying the Space Shuttle to Artemis missions what a legacy, sadly they will be expended at the end of launch.

[Stellarix @Stellarixorine]

🌌 In the wings of Cygnus the Swan, 6,000 light-years from Earth, lies NGC 6914 — a living canvas painted by the universe itself.

[Stellarix @Stellarixorine]

📏✨ The AU is measured from the center of Earth to the center of the Sun, not from their surfaces. Before spacecraft, astronomers refined this cosmic yardstick using transits, radar echoes, and planetary motions.