EVERYDAY SCIENCE

Detailed explanation-1: -A galaxy is a giant, spinning object made of gas, dust, and stars held together by gravity. Galaxies come in different shapes and sizes and can contain billions of stars.

Detailed explanation-2: -Type c spiral galaxies have the most gas and dust.

Detailed explanation-3: -If you look in any astronomy textbook, you’ll find somewhere a diagram of the Milky Way Galaxy with dimensions: the disk of our galaxy is about the disk is about 40, 000 parsecs = 40 kilo-parsecs = 40 kpc across, and the Sun is about 8, 000 parcsec = 8 kpc from the center.

Detailed explanation-4: -Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity.