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The size of the black hole - that is, the diameter of the event horizon - will increase if the mass of the black hole increases. Over time, black holes normally do gain extra mass from attracting it through gravity. However, they can also lose mass via Hawking radiation and eventually evaporate. Hence, the age of a black hole has little relevance to its size.

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How can astronomers detect where black holes are if no form of radiation can ever get out of a black hole?

There are two ways of detecting black holes indirectly. First, it is possible to observe the effects of a black hole's gravity on nearby objects. Second, while no radiation can come from within a black hole's event horizon, mater that has not yet crossed can still be seen. If a large amount of matter is falling toward a black hole, then it can become superheated and emit intense x-rays.


Do you put on the red terminal first or the black?

It is best practice to connect the red terminal first when attaching jumper cables, followed by the black terminal. This minimizes the risk of causing a short circuit while connecting the cables to the batteries.


What is a super-massive black hole?

A supermassive black hole is a black hole with a very large mass, millions to billions times the mass of the sun. The supermassive black hole in our galaxy is about 4 million times the mass of the sun.


Do you think that one day our sun will be converted into a black hole?

There is not chance the Sun will become a black hole. It does not have enough mass to achieve this, nor does it have any chance of gaining any. Our Sun will die in about 5 billion years time, first as a red giant and then after it has created a planetary nebula, all that will be left, will be a white dwarf.


When the sun dies what kind of star will it be?

It will first become a red giant, then turn into a white dwarf and in billions and billions of years it will become a black dwarf.