I wondered what are the sizes of celestial objects and decided to write this comparison.
It will be written in the form radius / diameter and followed by approximate mass. Every number in this post is estimation I have found on the Internet.
Earth 6.371 km / 12.742 km..... 5.9722 x 10`24 kg
Sun 696.340 km / 1.392.680 km..... 1.989 × 10`30 kg
Milky Way galaxy 52.850 ly / 105.700 ly..... 1.5 trillion solar masses (2 x 1.5 trillion x 10`30kg)
(note: there are various estimates for radius of the Milky Way so this is just provisory)
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Neutron star 10 km / 20km..... 1.4 solar mass
Stellar black hole 3 km / 6 km..... 1 solar mass
Supermassive black hole Sagittarius A 22.000.000 km / 44.000.000 km..... 4 million solar masses.
Conclusion:
Typical neutron star has 1.4 mass of the Sun but it occupies 70.000 times less space making it 70.000 more dense than our Sun.
Stellar black holes are even more dense than neutron stars by the factor of 3.
You want layman comparison? I got a good one: take A4 paper and fold it 70 thousand times to get a sense of a density of a neutron star, or 210.000 times for stellar black holes, compared to the Sun.
Supermassive black hole has 31 times bigger diameter than Sun which sole fact would make us think that it is a huge object. Well, it is, but we must take the mass difference into the account as well: 4 million solar masses in the 31 times bigger diameter or 129.032 higher density than Sun.
Therefore, the density ration between Sun, neutron star, stellar and supermassive black hole is, roughly speaking, about 1 : 70.000 : 210.000 : 129.032 with proportionally stronger gravity.
It will be written in the form radius / diameter and followed by approximate mass. Every number in this post is estimation I have found on the Internet.
Earth 6.371 km / 12.742 km..... 5.9722 x 10`24 kg
Sun 696.340 km / 1.392.680 km..... 1.989 × 10`30 kg
Milky Way galaxy 52.850 ly / 105.700 ly..... 1.5 trillion solar masses (2 x 1.5 trillion x 10`30kg)
(note: there are various estimates for radius of the Milky Way so this is just provisory)
_____________________________________________
Neutron star 10 km / 20km..... 1.4 solar mass
Stellar black hole 3 km / 6 km..... 1 solar mass
Supermassive black hole Sagittarius A 22.000.000 km / 44.000.000 km..... 4 million solar masses.
Conclusion:
Typical neutron star has 1.4 mass of the Sun but it occupies 70.000 times less space making it 70.000 more dense than our Sun.
Stellar black holes are even more dense than neutron stars by the factor of 3.
You want layman comparison? I got a good one: take A4 paper and fold it 70 thousand times to get a sense of a density of a neutron star, or 210.000 times for stellar black holes, compared to the Sun.
Supermassive black hole has 31 times bigger diameter than Sun which sole fact would make us think that it is a huge object. Well, it is, but we must take the mass difference into the account as well: 4 million solar masses in the 31 times bigger diameter or 129.032 higher density than Sun.
Therefore, the density ration between Sun, neutron star, stellar and supermassive black hole is, roughly speaking, about 1 : 70.000 : 210.000 : 129.032 with proportionally stronger gravity.