What Is The Smallest But Heaviest Object?

There is no definitive answer to this question as it depends on a number of factors, including the definition of 'smallest' and 'heaviest'. However, we can narrow down the possible answers by considering some of the densest objects in the known universe.

One contender for the title of smallest but heaviest object is a neutron star. Neutron stars are incredibly dense - so much so that a single teaspoonful would weigh around 4 billion tonnes! They are also very small, with diameters of just 20-30km. This makes them incredibly difficult to observe directly, but we know they exist because when they form (usually from the collapse of a massive star), they emit a burst of electromagnetic radiation known as a 'pulsar'.

Another possibility is a black hole. Black holes are even more dense than neutron stars, and can have masses millions or billions times that of our Sun. However, their size depends on their mass - the smaller the mass, the smaller the black hole. There is currently no lower limit on how small a black hole can be, but theoretical models suggest that there could be microscopic black holes with diameters less than 10^-24m! These tiny objects would have an incredible density, and would be virtually impossible to detect directly.

So what is the smallest but heaviest object in the universe? It's hard to say for sure, but it is likely either a neutron star or a black hole.

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