Question

what causes a supernova? (1 point)
energy of heat
force of gravity
energy of a nebula
force of a nebula

Explanation:

A supernova is a powerful stellar explosion. When a massive star (usually with a mass several times that of the Sun) has exhausted its nuclear fuel, the core collapses under its own gravitational pull. This collapse leads to a rebound shock wave, and the outer layers of the star are violently expelled. The force driving this collapse and subsequent explosion is the force of gravity. Heat energy alone isn't sufficient to cause such a cataclysmic event. A nebula is a cloud of gas and dust in space, and neither the energy nor the force of a nebula causes a supernova.

Answer:

force of gravity