A nova is a sudden brightening of a star that occurs when A) material is transfe

Question

A nova is a sudden brightening of a star that occurs when

A) material is transferred onto the surface of a white dwarf from a companion star in a binary system, then subsequently blasted into space by a runaway thermonuclear explosion (leaving the white dwarf intact to repeat the process).

B) material from a companion star is transferred onto the surface of a white dwarf star in a binary system, after which runaway carbon-fusion reactions cause the entire white dwarf to be destroyed in an explosion.

C) the electron degenerate iron core of a massive star collapses after its mass becomes greater than the Chandrasekhar mass limit.

D) material is transferred onto a neutron star from a companion star in a binary system, causing the neutron star to collapse into a black hole.

Explanation / Answer

C) the electron degenerate iron core of a massive star collapses after its mass becomes greater than the Chandrasekhar mass limit.

And as the core collapses an outward shock in the direction from center to surface blows of the surface and causes the nova explosion

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