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About 70,000 km/s. 1/4 the speed of light.

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Q: What is the core collapse speed for a supernova?
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When the core in a giant star collapse it create what?

supernova


What is the estimated number of nutrinos released by the collapse of a supernova?

There are about 40 to 50 of neutrinos released by the collapse of a supernova. This is known as a massive star.


When does a type 2 supernova begin to explode?

A massive red supergiant star will eventually explode as Type II supernova. That happens when the high mass star has run out of its nuclear "fuel". A series of nuclear fusion reactions finally ends at the nucleus of iron. A massive core of iron remains and iron can't be used to produce energy by nuclear fusion. The core collapses under gravity and the energy released throws the outer layers of the star into space in a supernova explosion. This is a Type II supernova. Sometimes it's referred to as a "core collapse" supernova, for obvious reasons. A bit more detail, if needed: A "high mass star" in this context is one with a mass of at least 8 times the mass the Sun. They develop into red supergiant stars. The mass of the iron core needs to be over the "Chandrasekhar mass" of about 1.4 times the Sun's mass. A core of that mass is unable to resist gravitational collapse. Depending on the mass of the iron core, collapse may stop at a "neutron star". Otherwise there is a complete collapse to a "black hole". See "Sources and related links", below.


What happens to a massive star when its fusion period is over?

Once a star's nuclear fusion has ended, it will collapse inside its core and become what is known as a white dwarf. Its outer layers will shoot out into the universe as planet nebula. If they are very large, stars will explode into a Supernova and their core will collapse into a black hole.


What type of star is Saiph?

Saiph is a supergiant star, which is the biggest and brightest class of stars. However, it has used the hydrogen in its core and is losing mass; it will eventually collapse in on itself and become a supernova.


What is produced when the outer core of star explodes after the core collapses?

Supernova


What is produced when the outer core of the star explodes after the core collapses?

Supernova


Does a supernova implode or explode to form a black hole?

It depends on the mass of the star. When massive stars die the result is usually an enormous explosion called a supernova, but the core will collapse to form a dense remnant. If the remnant is less than 3 times the mass of the sun then it will form a neutron star. If it is greater than 3 times the mass of the sun it will form a black hole. Extremely massive stars may collapse directly into a black hole with no supernova.


Sometimes the leftovers of a supernova collapse to from a?

A black hole or a neutron star.


For supernova explosions caused by collasping cores the core itself will either become a neutron star b white dwarf c black?

In a supernova explosion, the core of the star typically, we believe (because we've never had an actual example to study) collapse into a black hole. There may be some cases in which the core is "only" compressed to neutron-star density, but our understanding of the mathematics of extreme gravity and pressure is a little weak around the edges there.


What determines whether a star will form a black hole when it dies?

The mass of the remaining core of a star that has exploded as a supernova. (Although some stars can collapse directly to a black hole without a supernova explosion)If the mass exceeds about 3 to 4 solar masses the degeneracy pressure of neutrons is insufficient to stop the collapse, and the object will inevitably collapse into a black hole.See related link for more information.


Why is mass important for a supernova?

Stars produce energy through nuclear fusion, producing heavier elements from lighter ones. The heat generated by these reactions prevents gravitational collapse of the star. The star builds up a central core which consists of elements, where the temperature at the centre of the star is not sufficient to fuse them. For main sequence stars with a mass less than about 8 Suns, the mass of the core will eventually lose mass as planetary nebulae until only the core remains. Which becomes a white dwarf.Stars with higher mass will develop a degenerate core where the mass will grow until it exceeds the Chandrasekhar limit [See Link]. At this point the star will explode in a core collapse supernova, leaving behind either a neutron star or a black hole.For Type II supernova [See Link] [See related] mass flows into the core by the continued making of iron from nuclear fusion. Once the core has gained so much mass that it cannot withstand its own weight, the core implodes. This implosion can usually be halted by neutrons (the only things that can stop a gravitational collapse). When the mass of the star is so great even neutrons fail. The collapse is abruptly stopped by the neutrons, matter bounces off the hard iron core, and turns the implosion into an explosion.For Type Ia supernova, [See Link] [See related] the energy comes from the runaway fusion of carbon and oxygen in the core of the white dwarf.