Inside a neutron star, matter is compressed to unimaginable densities. Previously, scientists speculated about its exact makeup, cycling through possible equations linking pressure and density. The new method tosses out guesswork: it directly ties the measurable mass and radius to the internal structure.
It’s like a watermelon: by weight and girth, you can judge ripeness without cracking it open. But with neutron stars, it’s even wilder: the heavier the star, the smaller it can be in diameter — thanks to monstrous gravity. Now, by measuring the mass and radius of actual pulsars (rapidly spinning neutron stars) or during supernova explosions, the method quickly reconstructs the “stuffing.”
In the future, this approach will not only help astrophysicists understand the birth of neutron stars, but also peek into the laws of matter under extreme conditions that can’t be recreated on Earth.
Collisions of neutron stars are the only known places where precious metals like gold and platinum are born.