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How big is a Neutron Star?

A Neutron Star is 24 kilometers

Introduction: What’s a Neutron Star?

Have you ever wondered what happens when a giant star dies? It can turn into a fascinating thing called a neutron star. These stars are not your average stars. They are the remnants of massive stars that have exploded and collapsed under their own gravity. They are incredibly small and incredibly dense - among the densest objects in the universe, in fact.

Neutron Star Size: Tiny But Mighty

Now, when we say neutron stars are small, we mean really small. Imagine the mass of our Sun, which is about 1.4 times bigger than our Earth, squeezed into a space just about 10 kilometers (6 miles) across. That’s roughly the size of a small city! To put it another way, a teaspoon of neutron star material would weigh about a billion tons on Earth. So, although neutron stars are tiny compared to most stars, they are incredibly heavy.

How Does That Compare?

Let’s think about size comparisons to understand how small yet massive neutron stars are:

  • Neutron stars are about 20 kilometers in diameter. That’s about the same as the length of Manhattan Island in New York City.
  • The Great Pyramid of Giza, one of the largest structures ever built by humans, is 139 meters tall. If we piled up about 143 Great Pyramids, we’d get the diameter of a neutron star.
  • The world’s largest passenger jet, the Airbus A380, is 73 meters long. About 273 of these planes, nose to tail, would equal the diameter of a neutron star. Even though neutron stars are so small, they have a mass of about 1.4 times that of our Sun. That’s like squeezing more than a million Earths into a space the size of a city!

More Than Just Size: What Makes a Neutron Star Special?

Neutron stars are not only remarkable for their size and mass. They have some other incredible traits too:

  • Neutron stars are born from supernovae, the spectacular explosions of dying massive stars.
  • Despite their small size, neutron stars are so dense that a sugar-cube-sized amount of neutron star material would weigh as much as a mountain.
  • Neutron stars spin incredibly fast, some as much as several hundred times per second.
  • Some neutron stars, called pulsars, emit beams of radiation that sweep through space like lighthouse beams as they spin. So, neutron stars might be small, but they are mighty in many ways. They’re a fantastic reminder of the power and wonder of our universe, fitting so much mass and energy into such a small space.

Conclusion: Size Isn’t Everything

In the grand scheme of the universe, neutron stars might seem like small potatoes. But as we’ve learned, size isn’t everything. These tiny cosmic objects pack a punch far beyond their size, reminding us that even the smallest things can be incredibly powerful and intriguing. So next time you look up at the stars, remember the mighty neutron stars: tiny, heavy, and spinning in the vastness of space.

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