A galaxy is a huge system of stars, planets, gas, dust, and dark matter bound together by gravity. The Earth is part of the Milky Way Galaxy.Structure of a GalaxyGalaxies are extremely large. A single galaxy can contain billions of stars along with solar systems, nebulae, and black holes. Galaxies are the building blocks of the universe.Types of GalaxiesSpiral Galaxies: Shaped like spirals with arms. Example: Milky Way, Andromeda.Elliptical Galaxies: Rounded and oval-shaped, contain older stars.Irregular Galaxies: No fixed shape, often formed from collisions.Key FactsThe Milky Way contains more than 100 billion stars.There are estimated to be over 2 trillion galaxies in the observable universe.Galaxies move apart due to the expansion of the universe.ExamplesMilky Way Galaxy (our galaxy)Andromeda Galaxy (nearest major galaxy)Sombrero GalaxyWhirlpool Galaxy

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What is a galaxy?

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Detailed Solution

A galaxy is a huge system of stars, planets, gas, dust, and dark matter bound together by gravity. The Earth is part of the Milky Way Galaxy.

Structure of a Galaxy

Galaxies are extremely large. A single galaxy can contain billions of stars along with solar systems, nebulae, and black holes. Galaxies are the building blocks of the universe.

Types of Galaxies

Spiral Galaxies: Shaped like spirals with arms. Example: Milky Way, Andromeda.
Elliptical Galaxies: Rounded and oval-shaped, contain older stars.
Irregular Galaxies: No fixed shape, often formed from collisions.

Key Facts