Galaxy types!
There is an estimated 2000 billion galaxies and they can be grouped into 3 main types, spirals, ellipticals and irregulars.
Including our galaxy, the milky way, 75 percent of all galaxies are spirals. They have a nearly spherical bulge at their centre filled with ancient red and yellow stars and sometimes a supermassive black hole.
The ellipticals are the next most common and they have an egg-like shape. Ellipticals range in size from dwarfs, to some of the largest galaxies in the universe that can be up to 300 million light years away.
The least common are the irregulars that have no regular shape or structure. they contain losts of gas and dust which is a great place for new stars to form and they are filled with them.
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