How long can a black holes exist?

Answer 1

It all depends on the mass of the black hole. It's called Hawking radiation.

A black hole with the mass of:

• 200lb - Near instantly
• A Car - a nanosecond
• The Moon - Slightly more time (not Five Billion Years)
• The Sun - A Black hole with the mass of the Sun will never evaporate due to it feeding on the energy in space. As the Cosmic Background Radiation is 2.7 Kelvin, the Hawking Radiation will cause for 100nanokelvins to be consumed do to Hawking Radiations Inverse relationship with the mass of a Blackhole. The bigger the Blackhole the less Hawking Radiation it will produce. As long as the universe has some warmth, namely the 2.7 kelvins, these types of Blackholes and larger will never evaporate.

Answer 2

A black hole will eventually evaporate through its Hawking radiation, but for a large black hole, this process is very, very slow. For a black hole that has the mass of our Sun, it will take about 1067 years to evaporate completely. Larger black holes - for example, black holes the mass of a galaxy, which are expected to form eventually - will take even longer.

Answer 3

Blackholes were once thought to exist forever, as originally they were thought of as 'sinks' from which nothing could escape. Now, with the discovery of Hawking radiation, it is theorized black holes will shrink, as a result of swalling negative 'virtual particles' that are separated from vacuum fluctuations by the black holes gravitation pull.

Though the release of hawking radiation will shrink the black hole, most stellar mass black holes release it so slowly they are actually growing, just by feeding on the background radiation throught the universe! Only the smallest black holes will see any noticable effect.

Bottom line... it depends on the size, small black holes (such as the ones predicted to be created by the LHC) can exist any amount of time over the Plank time; virtually instantly. But larger black holes will last a long, long time. A black hole that weighs as much as the sun will last 2.099496e+67 years. And one that weighs a billion times as much ( like those in the center of galaxies) could last 2.099496e+94 years.

That's like writing 2 with 94 zeros after it! And the universe is only around 15000000000 years old. So, chances are, the largest black holes will still be around long after everything else is gone and many models of the universe end with it being swallowed by the giants.

Answer 4

The length of time a black hole can exist for is thought to be directly proportional to not only the mass of the black hole but as well as what point in time it exists in.

It is theorized that black holes only lose mass as they emit Hawking radiation (Thermal-type radiation; heat). However black holes do constantly absorb mass from the cosmic background radiation that exists everywhere.

However, the temperature of the cosmic background radiation (And therefore how much is absorbed) is inversely proportional to the age of the universe (The universe cools as it ages). At this point in time, it's thought that the cosmic background radiation feeds black holes more mass than is lost through radiating mass. So as the universe cools, eventually the net mass change will reach an equilibrium, allowing net loss through radiating mass to dominate the net change and finally allow those black holes to evaporate.

There is a lot of math involved in calculating how long until a black hole of a specific mass reaches a net mass change equibilrium. For a black hole with the mass of the Sun, it will take approximately 100 octillion years (100 with 27 zeros) to reach an equilibrium. The math behind the calculations should be easily found on Google, however, I warn you, there is a lot of complex math involved.

Answer 5

Since black holes are thought to thermodynamically interact with the universe, they can radiate away energy and thus mass (per matter-energy equivalence) through a mechanism called Hawking radiation, shrink over astronomically long periods of time and evaporate entirely. Although calculated to be very weak, this radiation is thought to be low for large black holes and greater for smaller black holes, hence, a mini black hole would not live as long as a larger one. In reality there are other factors at play; for example, black holes tend to suck in matter through their powerful gravitational field and thus generally grow over time; so the region of space they were in would need to be generally clear of matter. Also, the universe evidences a cosmic background radiation, which for the larger black holes would tend to counter the loss of mass through Hawking radiation.

Answer 6

Black holes can exist for trillions of years, with their lifetimes depending on their size. Smaller black holes might evaporate due to Hawking radiation over an extremely long period, whereas supermassive black holes at the centers of galaxies could persist for billions or even trillions of years.

Answer 7

Very small black holes can "evaporate" by quantum-mechanics, but most black holes will exist for VERY LONG TIMES. About as long as the universe for some

Answer 8

--A black hole stays in the universe forever.