I never heard about an exploding galaxy. Perhaps you are confusing this with something else.
who discovered the galaxies who discovered the galaxies
Spiral galaxies, barred spiral galaxies, elliptical galaxies, and irregular galaxies
The possessive form for the plural noun galaxies is galaxies'.Example: Their galaxies' paths do not coordinate.
The verb for explode is "explode."
Elliptical galaxies are sometime called dwarf galaxies.
15 Galaxies? There are over 1,000,000,000 galaxies possibly more.
spiral galaxies (ours), irregular galaxies, and elliptical galaxies.
no galaxies are not harmful
You can have dwarf elliptical galaxies.
Elliptical galaxies are large blob shaped galaxies that most galaxies will eventually look like. Elliptical galaxies are what happens when two or more large galaxies collide and coalesce.
one kind is lenticular galaxies
They are called Spiral Galaxies or Barred Galaxies.