Compare and contrast spiral and elliptical galaxies

Spirals are huge, contain stars, dust and gas  and are held by gravity. A halo is present in Spirals, They have a pinwheel shape, and have a bulge and a thin disk. They are rich in gas and dust, and both young and old stars are present.

Ellipticals have a oval shape, they do have a bulge but they got no disk. They also have a small amount of cool gas and dust and mostly old stars are present, They also have a halo, are held by gravity, and contain stars, gas, and dust like the Spirals.

Because its reliable.   there is no pollution  the chances of a radiation leak is low