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Space objects in 3D NASA created 3D models of stars and supernova remnants by combining data from the Chandra X-ray Observatory with computer calculations. These models can not only be viewed on the screen, but also printed on a 3D printer. Here they are, from left to right —... show more

Black Hole

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13,055 views • 1 year ago •via X (Twitter)

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This 3D printed word illusion design created in Tinkercad by Moosey (In the Snow) shows MOM from one direction, DAD from another, and has a surprise on the bottom! 🌹 ♥️ 🌷 ♥️ 🌹

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584,511 views • 10 months ago

Astronomers just watched a star explode - and saw its insides exposed. For the first time in history, scientists got a direct look inside a star at the moment it went supernova - revealing inner layers that had, until now, only existed in theory. A massive star 2.2 billion light-years away reached the end of its life and exploded in a brilliant burst of light. But something was off. When researchers analyzed the spectrum of light from the explosion, they didn't see the usual lighter elements like hydrogen, helium, or oxygen. Instead, they saw silicon. Sulphur. Argon. Elements normally buried deep inside a star's core. This wasn't supposed to be possible. According to stellar models, massive stars - those at least eight times the mass of our Sun - are layered like onions. Their cores are packed with heavy elements like iron, while progressive lighter layers of silicon, oxygen, and carbon sit above. Hydrogen and helium form the outermost shells. These outer layers usually obscure everything underneath. Astronomers believe the star violently ejected its outer layers in the final stages of life – not just the hydrogen and helium, but even the middle shells that hide the deeper interior. It’s possible that extreme instability in stars more than 100 times the mass of our Sun could cause this kind of shedding. While similar “pre-explosion outbursts” have been seen in other stars, this is the first time they’ve exposed the inner structure so clearly. The supernova was first detected by the Zwicky Transient Facility in California. Within 24 hours, astronomers triggered rapid follow-up observations with Hawaii’s Keck Observatory and captured the light signature before the explosion faded. That speed was critical. Supernovae evolve quickly, sometimes over just a few hours, and once the star’s material expands and cools, the deeper layers disappear from view. Read the study: Schulze, Steve, et al. “Extremely Stripped Supernova Reveals a Silicon and Sulfur Formation Site.” Nature Credit: Keck Observatory/Adam Makarenko

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Black Hole

26,579 views • 11 months ago

On March 6, 2015, astronomers reported observing a supernova in a distant spiral galaxy. Although the explosion itself occurred millions of years earlier, the light carrying that event had only just reached Earth after traveling across intergalactic space. This delay is not unusual but a fundamental feature of the universe, where distance and the finite speed of light turn every observation into a glimpse of the past. In this way, telescopes function not just as instruments of sight, but as time machines, revealing events long after they have concluded. Each distant supernova reminds us that the cosmos we observe is a layered history, unfolding to us not as it is now, but as it once was across unimaginable spans of space and time. Credit: NASA/ESA Hubble Space Telescope

On March 6, 2015, astronomers reported observing a supernova in a distant spiral galaxy. Although the explosion itself occurred millions of years earlier, the light carrying that event had only just reached Earth after traveling across intergalactic space. This delay is not unusual but a fundamental feature of the universe, where distance and the finite speed of light turn every observation into a glimpse of the past. In this way, telescopes function not just as instruments of sight, but as time machines, revealing events long after they have concluded. Each distant supernova reminds us that the cosmos we observe is a layered history, unfolding to us not as it is now, but as it once was across unimaginable spans of space and time. Credit: NASA/ESA Hubble Space Telescope

Cosmos Archive

23,079 views • 3 months ago

📢 Our lab has been exploring 3D world models for years — and we’re thrilled to share **PhysTwin**: a milestone that reconstructs object appearance, geometry, and dynamics from just a few seconds of interaction! Led by the amazing Hanxiao Jiang 👉 PhysTwin combines **Gaussian splatting** with **inverse dynamics optimization** based on simple **spring-mass** systems. ⚙️ The result? Real-time, action-conditioned 3D video prediction under novel interactions (i.e., 3D world models). 🔑 A few key takeaways: 1. Having the right structure (e.g., particles/masses) helps navigate the trade-off between sample efficiency, generalization, and broad applicability. 2. Visual foundation models (VFMs) have matured to the point where they can provide rich supervision for world modeling (e.g., tracking, shape completion). 3. Beyond VFMs, many crucial components have come together in recent years: Gaussian splats for rendering, NVIDIA Warp for high-performance simulation, and scene/asset generation from a wide range of labs and companies. The future of 3D world models is looking bright! ✨ 4. The resulting digital twin supports a wide range of downstream applications—especially in data generation and policy evaluation, thanks to its realistic rendering and simulation capabilities. 🎥 All code and data to reproduce the results, along with interactive demos, are available on the website. Check the following visualizations of: (1) observations, (2) reconstructed state/actions, (3) interactive digital twins, and (4) the overlays between real-world robot teleoperation and our model’s open-loop predictions.

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Yunzhu Li

25,279 views • 1 year ago