Welcome to the world of the possible and the impossible.

On this page you can find various articles that deal with science, mathematics, physics, computer science, chemistry, biology, geology and engineering.

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The Hercules–Corona Borealis Great Wall

The Hercules–Corona Borealis Great Wall is the largest known super-structure in the universe. It is a huge group of galaxies forming a giant sheet-like pattern which is about 10 billion light-years long (for perspective, the observable universe is about 93 billion light years in diameter), 7.2 billion light-years wide, and almost 1 billion light-years thick. It is about 10 billion […]

Wolf–Rayet Stars

Wolf–Rayet stars (WR stars) are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds. The surface temperatures of known Wolf-Rayet stars range from 20,000 K to around 210,000 K, hotter than almost all other kinds […]

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