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China’s latest hydrogen-powered drone flew non-stop for 30 hours, setting a new national record — and sending a bold message about the future of aviation. Developed by AVIC and Tsinghua University, this 50kg UAV isn’t just impressive — it’s carbon-free, whisper-quiet, and runs on the most abundant element in the universe.

With 5G control systems and eco-friendly propulsion, this drone proves that the skies of tomorrow could be clean, connected, and completely hydrogen-powered. No fuel. No emissions. Just pure flight.

See the drone record and potential:
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The Milky Way and Andromeda are two of the most iconic and studied galaxies in the universe. Though they share similarities, they also have striking differences that make each one unique.

What They Have in Common
Spiral Shape: Both are majestic spiral galaxies, featuring sweeping arms of stars, gas, and dust wrapped around a central bulge.

Barred Structure: Each galaxy has a central bar-shaped core, a common feature in large spiral galaxies.

How They Differ
Size:
Andromeda spans ~220,000 light-years, making it nearly twice the size of the Milky Way, which measures about 100,000 light-years.

Location:
Milky Way is our cosmic home.
Andromeda lies 2.5 million light-years away from us.

Future Collision:
They're on a cosmic collision course! In about 4.5 billion years, the two galaxies are expected to merge, forming a new elliptical galaxy—sometimes dubbed Milkomeda.

Unique Traits
Andromeda: Hosts a larger entourage of satellite galaxies, including dozens of dwarfs in orbit.

Milky Way: Features a richer, more dynamic structure with a pronounced bar and vivid, active spiral arms.

Together, these galactic giants help scientists unravel the mysteries of how galaxies form, evolve, and interact across billions of years.

Einstein-Rosen Bridge: Theoretical Gateways Through Spacetime

First proposed in 1935 by Albert Einstein and Nathan Rosen in their landmark paper “The Particle Problem in the General Theory of Relativity,” the Einstein-Rosen (ER) bridge—commonly referred to as a wormhole—is a theoretical construct that suggests a tunnel or shortcut linking two distant regions of spacetime.

Core Concepts of the ER Bridge
Mathematical Framework: ER bridges are not physical structures but mathematical solutions to Einstein’s field equations, describing how two separate regions of spacetime might be connected.

Wormhole Anatomy: Visualized as a tunnel with two ends or "mouths," the ER bridge forms a passage through spacetime, known as a throat.

Spacetime Shortcuts: These bridges imply the possibility of instantaneous travel between distant cosmic locations—at least theoretically.

Theoretical Significance
Quantum Gravity Connection: ER bridges play a key role in efforts to unify general relativity and quantum mechanics—an ongoing quest in modern physics.

Topology of the Universe: They challenge conventional ideas of spacetime structure, offering new perspectives on how different points in the universe might be intertwined.

Legacy and Influence
Wormhole Exploration: The concept of the ER bridge laid the foundation for modern wormhole research, sparking interest in both science and science fiction.

Impact on Physics: It remains a powerful idea in theoretical physics, influencing debates around quantum entanglement, black holes, and the fabric of reality itself.

An international team of physicists led by Professor Enrique Gaztañaga of the Institute of Cosmology and Gravitation at the University of Portsmouth has questioned the idea that the Universe began with the Big Bang.

This new theory challenges the traditional Big Bang model by proposing that our universe was born inside a black hole from a previous universe.

Published in Physical Review D, the model uses Einstein–Cartan theory, which includes quantum "torsion" to prevent singularities. Instead of a singular beginning, the universe undergoes a "bounce" inside the black hole, expanding outward to become a new cosmos.

This bounce naturally explains both the early rapid expansion (inflation) and the current accelerated expansion (dark energy), without needing exotic new particles or fields.

The model also predicts a slightly curved, closed universe—something future space missions like ESA’s ARRAKIHS or NASA’s SPHEREx may be able to detect.

One of the most compelling predictions is that our universe could carry the spin of the parent black hole, potentially explaining why two-thirds of galaxies seem to rotate in the same direction.

If confirmed by future observations, this cosmic spin could be a key signature supporting the theory.

In essence, this bold idea reimagines our universe not as the beginning of everything, but as part of a cosmic cycle, where each black hole could spawn a new universe—each with its own evolution.