Can 'planet' become blackhole?

  • Thread starter Chitose
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sorry if like i'm not respond, I just try to understand what you guys are talking.

so... in theory, not just star but anything can become blackhole as long as it's escape velocity greater than light. right?

I also post same question in my country as well,
some says, if planet mass keep increase, it's core will hot melt ignite the gas and become star themselves... really?
and also, it will become like pulsar before become blackhole.
 

Drakkith

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sorry if like i'm not respond, I just try to understand what you guys are talking.

so... in theory, not just star but anything can become blackhole as long as it's escape velocity greater than light. right?

I also post same question in my country as well,
some says, if planet mass keep increase, it's core will hot melt ignite the gas and become star themselves... really?
and also, it will become like pulsar before become blackhole.
1. If you keep adding mass, will the core eventually ignite and the "planet" turn into a star?

That depends on what you add. If we added elements lighter than iron, and we added that mass quick enough so that the core was unable to give off heat fast enough to cool, then yes, eventually the core will be so hot that fusion will occur. Note that the amount of mass you need to add depends on what material forms the new core. Adding about 0.075 solar masses of hydrogen would be enough to ignite fusion, whereas helium would require at least 0.5 solar masses. Heavier elements require even more mass to reach the ignition temperature.

If we add iron or anything heavier, we do not see fusion, as the cores collapses before it ever heat up high enough to fuse them. (And they are endothermic reactions anyways)

2. Will it become a pulsar before a black hole?

That depends. If we add a LOT of mass (about 15-20 solar masses) we'd create a huge star that would eventually collapse directly into a black hole instead of a neutron star.
 

Chronos

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I know. I'm still right, it is impossible to bring more mass to Earth.
The earth has gained mass over its entire history - its fact, not opinion, with an entirely reasonable physical explanation. Facts trump any theory.
 
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ref can 'planet' become blackhole?

yes...but its not easy ( or perhaps even possible ) if you are in a big hurry timewise

I am quite sure there are 1000's of blackholes in the universe right now that where once planets BUT you can be almost 100% certain that they became black holes after becoming a star (the planet acting as a stellar seed)

Could a planet naturally become a black hole without going through the star phase ? probably not in a universe that's only 14 billion years old. But it might just be possible to figure out a fantastical flukey 'natural schema' that could pave the way. That would be a lot of work and quite probably require far too much artistic license to be worth while investigating.

Ultra-Cold Brown Dwarf Discovered?
http://news.discovery.com/space/astronomy/ultra-cold-brown-dwarf-new-record-breaker-110312.htm

Somewhat related to the OP (and time) Black Dwarf
http://en.wikipedia.org/wiki/Black_dwarf

Stages en route to black hole-dom
http://en.wikipedia.org/wiki/Electron-degenerate_matter#Degenerate_gases





DIY Cold Black hole using a planet as a seed


There might well be an exotic mix of matter that you can drop onto the planet which effectively turns it into an anti fusion reactor. Some weird energy harmonics that means fusion is A) less likely and B) more endothermic.

Sort of the opposite of the carbon harmonic ( some weirdness which means more carbon is created than one would initially envisage) In this case we are after less heat.

Off the cuff i would go with a lead core and sprinkle on nickel/iron at absolute zero & perhaps some lighter atomic spice that likes emitting e-rays or spewing magnetic flux ( shedding energy and aiding cooling )


Issues or solutions to fast track black hole creation ?
http://en.wikipedia.org/wiki/Helium_flash

http://en.wikipedia.org/wiki/Carbon_detonation





Chitose, be rest assured the question in your OP will eventually be inverted and make its way into the physics exam hall. I pity the poor student faced with the question " what is the minimum time frame in which one could construct a dark black hole "


...i just figured out a way but im not telling anyone
 
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