SOLAR SYSTEM

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. Most occur in groups that are also held together by gravity.

Detailed explanation-2: -Galaxies are complex structures comprised of many individual parts, such as stars, gas, dust and dark matter.

Detailed explanation-3: -A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle.

Detailed explanation-4: -There are three general types: elliptical, spiral, and irregular. Perhaps the most familiar kind of galaxy are spiral galaxies. They have a distinctive shape with spiral arms in a relatively flat disk and a central “bulge".

Detailed explanation-5: -The collective noun for dust is ‘cloud’, ‘layer’ or ‘pile.