neutron star

There is a rough analogy between a black hole and an atom. In both cases, the mass is concentrated in a tiny region at the center, but the “size” of the object is much bigger. The radius of a nucleus is (r = A1/3 x 1.7 x 10-13 cm), where A is the mass number of the nucleus….Density of Black Holes.

A black hole’s density, consequently, can be obtained by dividing the mass/energy of the black hole by the volume of a sphere (or spheroid) that is found interior to the black hole’s event horizon.

As you might expect, the event horizon of a black hole gets bigger as the mass gets bigger. That’s because if you add mass, the gravity gets stronger, which means the event horizon will grow.

You can use the Schwarzschild radius to calculate the “density” of the black hole – i.e., the mass divided by the volume enclosed within the Schwarzschild radius. This is roughly equal to (1.8×1016 g/cm3) x (Msun / M)2, where M is defined as above.

about 78 billion miles

When you fall into a black hole or simply get very close to the event horizon, its size and scale… As you get closer and closer to the event horizon, it starts to cover everything in front of you. Once you cross that event horizon, your fate is sealed.

Although their gravity is stronger, the stretching force is weaker than it would be with a small black hole and it would not kill you. The bad news is that the event horizon marks the edge of the abyss. Nothing can escape from inside the event horizon, so you could not escape or report on your experience.

No. Stars like the Sun just aren’t massive enough to become black holes. Instead, in several billion years, the Sun will cast off its outer layers, and its core will form a white dwarf – a dense ball of carbon and oxygen that no longer produces nuclear energy, but that shines because it is very hot.

If our sun dies, will it become another black hole? No, our Sun is much too small to become a black hole. As it exhausts its hydrogen fuel, our Sun will start burning helium, swell in size and briefly become a red giant (giant in size, though not in mass), probably exceeding the size of the orbit of Venus.

In either case, an exploding Moon, by natural means at least, is pretty unlikely for now. That leaves artificial methods — probably some kind of enormous bomb. It is not impossible to blow up the Moon with a bomb, but it would be a massive job (a single nuke isn’t going to cut it, you’d need millions).

Destroying the Moon would send debris to Earth, but it might not be life-exterminating. Imagine a weapon so deadly it could gravitationally unbind the Moon, blowing it apart.

The project was never carried out, being cancelled after “Air Force officials decided its risks outweighed its benefits”, and because a Moon landing would undoubtedly be a more popular achievement in the eyes of the American and international public alike.

Not possible, says NASA about Elon Musk’s plan to make it our new home. In a bid to transform the red planet to make it habitable for the human race, Space X Founder Elon Musk recently said that he would Nuke Mars to make the planet warm.

six feet

Tsar Bomba

Although some windows may be broken over 10 miles (16 km) away, the injury associated with flying glass will generally occur at overpressures above 0.5 psi. This damage may correspond to a distance of about 3 miles (4.8 km) from ground zero for a 10 KT nuclear explosion.

75 years

“Compared with other nuclear events: The Chernobyl explosion put 400 times more radioactive material into the Earth’s atmosphere than the atomic bomb dropped on Hiroshima; atomic weapons tests conducted in the 1950s and 1960s all together are estimated to have put some 100 to 1,000 times more radioactive material into …