If the core of a supernova contains about one solar mass, the core will become a
protostar
red dwarf
white dwarf
neutron star
black hole

Neutron Star

Explanation:

"If the remaining core contains about 1.4 solar masses within a 20 km radius, it can become a neutron star."

If you are trying to find what a core will become with 3 or more solar masses, you are on the wrong question.

f=gm1m2/d^2 it d

f is force g is gravitaiton constant, m1 is mass of first object, m2 is mass of second object. d is distance between two object

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.