A city-sized sphere containing the weight of a mountain in a single sugar cube
In short: When a massive star runs out of fuel, gravity wins the ultimate tug-of-war. The resulting collapse creates a neutron star: an object so dense that a single sugar cube of its material would weigh about 1 trillion kilograms on Earth. These cosmic remnants offer a glimpse into physics we cannot replicate.
The life of a star is a delicate balancing act between the inward pull of gravity and the outward pressure of photons generated during nuclear fusion. When a star between 8 and 20 solar masses exhausts its fuel, this outward push ceases. Gravity takes over, causing the core to collapse while the outer layers are expelled in a supernova explosion.
What remains depends entirely on the original star's mass. A neutron star forms when the original star's mass equals approximately 7 to 19 solar masses. If the star's mass exceeded 20 times that of our Sun, the collapse continues until a black hole forms. Unlike black holes, which are hidden behind an event horizon, neutron stars allow us to directly observe the densest material in the known universe.
These objects are characterized by extreme physics. Some act as pulsars, rotating so rapidly that they emit beams of light that flash like cosmic beacons. The fastest known pulsar, PSR J1748-2446ad, rotates 43,000 times per minute—twice as fast as a typical household blender. Other varieties, known as magnetars, possess magnetic fields a thousand times stronger than other neutron stars, capable of releasing colossal bursts of energy across vast distances.
NASA estimates there could be as many as one billion neutron stars within the Milky Way galaxy. While many discovered are young and energetic, older neutron stars have spent billions of years cooling and slowing their rotation, remaining fascinating subjects for astronomers studying the limits of matter.
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Sources
- Summary by Intellect · source: Neutron Stars: Crash Course Astronomy #32
- Also: Neutron Stars Are Weird! - NASA Science
- Also: Neutron Stars: Definition & Facts
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