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156,577 次观看 • 16 天前 •via X (Twitter)

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We just saw the exact moment a star exploded for the first time ever. Astronomers have achieved a rare feat: imaging the exact moment a massive star detonated—and the explosion was anything but spherical. SN 2024ggi, a supernova located 22 million light-years away in the spiral galaxy NGC 3621, was detected a mere 26 hours after ignition. This extraordinarily early discovery allowed researchers to train the European Southern Observatory’s Very Large Telescope in Chile on the event while it was still in its infancy. Using the technique of spectropolarimetry—which analyzes the polarization of light to reveal geometric structure—the team uncovered a surprising truth: the expanding shockwave was distinctly aspherical, elongated into an “olive” or prolate shape along one primary axis. This asymmetry means the catastrophic rebound following the star’s core collapse did not propagate uniformly in all directions, directly contradicting the long-standing assumption that the deepest layers of a core-collapse supernova explode spherically. The progenitor was a red supergiant 12–15 times more massive than the Sun that had exhausted its nuclear fuel, triggering gravitational collapse of its iron core. In most supernovae, the initial shape of this breakout is quickly obscured as the blast wave slams into the star’s outer envelope. Here, however, astronomers captured polarized light signatures of the still-unobscured ejecta, freezing the explosion’s geometry in time. The discovery carries far-reaching consequences. It strongly suggests that asymmetry is common, if not universal, in the earliest phases of massive-star deaths. Current theoretical models, which often assume spherical symmetry at the core, will need significant revision. Moreover, these distorted explosions could help explain observed peculiarities in supernova remnants, the production of gamma-ray bursts, and the kicking of neutron stars and black holes to high speeds at birth. By catching a star in the act of dying asymmetrically, SN 2024ggi has given us a vivid glimpse into the violent, chaotic physics that govern the final heartbeat of the universe’s most massive stars. [🎞️ Artist’s animation of a supernova explosion] [Unique shape of star’s explosion revealed just a day after detection. ESO, 2025]

Massimo

363,612 次观看 • 8 个月前

🚨 SPACEX IS ABOUT TO TEST A RADICALLY DIFFERENT KIND OF SPACECRAFT AND IT COULD UPEND THE ENTIRE ORBITAL MANUFACTURING INDUSTRY. On Tuesday, SpaceX plans to fly the first prototype of Starfall, a flat, disk-shaped reentry capsule designed to return up to 1,000 kilograms of cargo from orbit in a single flight. That’s roughly 30 times more payload capacity than current commercial return vehicles (like those from Varda Space Industries). It’s not a scaled-down Dragon it’s a completely different approach: no onboard deorbit engine, a wide flat disk geometry, and Starlink terminals mounted to maintain communication through the plasma blackout during reentry. Why this matters: • Current orbital manufacturing companies are limited to returning only dozens of kilograms per mission • Starfall’s design could make large-scale commercial production in space economically viable for the first time • SpaceX would be directly competing with companies (like Varda) that currently pay SpaceX to launch their capsules • Successfully testing Starlink through reentry plasma would be a major technical win with applications across SpaceX’s vehicles The deeper implication: SpaceX is quietly expanding its vertical integration. They already dominate launch. Now they’re moving into the return leg of the orbital manufacturing supply chain the part that has been the biggest bottleneck for companies trying to make products in microgravity and bring them back to Earth. If Starfall works at scale, it doesn’t just give SpaceX another revenue stream. It gives them significant control over the economics of an entire emerging industry. The disk shape and high-capacity design suggest they’re thinking about high-cadence, lower-cost returns rather than the traditional high-value, low-volume approach. This is classic SpaceX: take an existing problem (expensive, low-capacity return from orbit), apply first-principles thinking to the vehicle design, and try to make it dramatically cheaper and higher volume. How do you think this move into orbital return changes the competitive landscape for companies trying to build businesses in space manufacturing? Follow for more analysis on SpaceX’s expanding role across the space economy.

TheNewPhysics

445,776 次观看 • 1 个月前