Question

define galaxy?its definition

Answer 1

Galaxy is the system of millions and billions of stars, plants, gas, dust astroide including satlites etc...

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Answer 2

Our Sun is just one of a massive collection of 200 billion stars arranged in a shape like a fried egg. 1,00,000 light years across. This collection is called the Galaxy, because we see it in the band of stars across the night sky called the Milky Way. But earlier this century it was realized that the Galaxy is just one of billions of similar giant star groups scattered throughout space, which we also call galaxies. The nearest is the Andromeda Galaxy.