Question

What kind of star is the smallest, with a typical one being only about 20 miles across?
Neutron Star
Red Dwarf
White Dwarf
Brown Dwarf

Answer 1

Hey there!

Q. What kind of star is the smallest, with a typical one being only about 20 miles across?

Answer : Neutron Stars

Extra information :

-- The stars which are composed of matter mainly in the form of neutrons are called neutron stars.

-- The neutron star arised from the collapsed core of a supernova.

-- The future of the neutron star depends on its mass.

-- Neutron stars are the smallest stars known to exist, with their typical being around 15 - 25km in diameter

Answer 2

What kind of star is the smallest , with a typical one being only 20 miles across ?

Answer : $\bold{NEUTRON \: STAR}$

Few lines-

The stars which are born from the explosive death of giant stars in supernova are known as Neutron stars.

Neutron stars are the stars which are completely made up of neutrons.  These are small in size compared to other stars.  

Neutron stars are planetary objects with a mass about 1.4 or 1.5 times than the sun in the universe.

Neutron stars are planetary objects that measure between 10 and 20 km across .

These stars are very hot and highly radioactive . These stars have density about  10¹⁷ kg/m³.