astrophysics

Subrahmanyan Chandrasekhar's life, the Chandrasekhar limit, and verified quirks: humiliated by Eddington, derived the limit at 19 on a ship, taught 2 students who both won Nobels.

How the Sun works: proton-proton fusion in the core, layers from radiative zone to corona, solar wind, sunspots, and the Sun's far future.

How stars explode as supernovae — Type Ia, core-collapse, kilonovae, famous examples, and why every iron atom in your body came from one.

Dyson spheres aren't solid shells — they're swarms of solar collectors around a star. Here's how they'd work, why we'd build one, and how we'd spot aliens using one.

The Big Bang explained: evidence from Hubble's law, the CMB, and primordial element abundances, plus the timeline of cosmic history and the universe's fate.

What is a black hole, really? Event horizons, Hawking radiation, spaghettification, the nearest known black holes, and the first images of M87* and Sgr A*.

The Moon's origin is reconstructed from rocks, its interior, and orbital models. A giant impact leads the explanation, but the precise scenario is uncertain.

Mars is the most explored planet beyond Earth: home to the largest volcano in the solar system, a canyon system thousands of kilometers long, and clear evidence that it once hosted flowing water. Here is what science has revealed.

About 4.57 billion years ago, a cloud of gas and dust collapsed under its own gravity. Out of the disk it left behind came the Sun, eight planets, hundreds of moons, and the debris belts of our cosmic neighborhood.

For two centuries, Newton's gravity was the gold standard. Then Einstein showed that gravity isn't a force at all — it's the curvature of spacetime itself. Here's what that actually means, and how it has been tested.

Pulsars produce repeating signals as neutron stars rotate. Their timing helps researchers study binary orbits and search for gravitational-wave backgrounds.

What would actually happen if gravity suddenly doubled? Your skeleton would fracture under your own weight, the atmosphere would compress into a dense killing fog, and tall buildings would collapse. But life could still evolve — just very differently.