Size comparison between the Earth and a black hole the mass of the Sun. A black hole with the mass of the Sun would have an incredibly small size compared to Earth. The key measure for a black hole is its Schwarzschild radius, which determines how large the event horizon (the point beyond which nothing can escape) would be. For a black hole with the Sun's mass, this radius is approximately 3 kilometers (about 1.86 miles).
In comparison, the Earth has a radius of about 6,371 kilometers (3,959 miles). Therefore, the black hole’s event horizon would be roughly 2,100 times smaller than the Earth's radius.
This means that while the Sun's mass would be contained in a region just a few kilometers across, Earth would appear immensely larger in comparison. The black hole would fit comfortably inside a small city!
