# What does this Black Hole calculator do?

## This new tool calculates the energy released among other things when a black hole collides with another astronomical body

Nov 21, 2019 · 3 min read

If our planet ever crosses paths with one of these cosmic predators, it would most certainly lead to the complete annihilation of the Earth from what we know of Black holes. The extreme gravitational forces at work around the black hole are such that even stars, which are much more massive than our planet are shred to pieces.

Nonetheless, the online tool is useful for academic purposes to calculate the energy released & changes to the mass and event horizon of the black hole after the collision. The Black Hole Collision Calculator, built by Álvaro Diez, a physics student at the University of Warsaw in Poland is part of the Omni Calculator Project — a broad directory of 901 free calculators on various subjects including Finance, Maths, Science, Health & Everyday life, etc.

As reported by Space.com, it took Diez about a week to get the calculator up & running besides making it visually appealing and easy to understand for the broader audience. This is not the first calculator Diez has built. He has three other calculators to his credit as well, all related to black holes.

Apparently, Diez was inspired by a recent spate of black hole news including the first-ever direct image of a black hole’s shadow, one of the biggest & one of the smallest black holes ever discovered among others.

Coming back to the calculator, it has eight fields altogether. We just have to input the mass of the black hole before the collision and the mass of the Impacting object which could be Earth or any other astronomical body. Both these masses can be represented in terms of Suns, Earths, metric tons or kilograms.

Considering you don’t know the distance of the black hole from the impacting object, the tool would calculate the mass of the black hole, event horizon radius after the collision & also show you the percentage growth of the event horizon after the impact.

Hypothetically speaking, if the Earth came in the way of the supermassive black hole Sagittarius A*, which is located at the center of our Milkyway galaxy and is about 4 million times more massive than the sun, it would produce 32,204,195,564,497,649,676,480,000,000,000,000 megajoules of energy. The black hole is so massive that the impact on its event horizon after devouring our planet would be negligible — only 0.00000000007281%.

Now go try & see what happens if Sagittarius A* collides with our Sun. What changes do you notice?

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