Understand the relative size and location of objects in the universe - Earth Science

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Question

What are distances in the universe commonly measured in?

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Answer

Distances in the universe are so vast that they can be difficult to comprehend. We measure distances in space using light years. A light year is about 6 trillion miles, the distance light travels in one Earth year.

We live on Earth, a planet in a solar system that orbits our sun. Our solar system is only part of a much larger system of many billions of stars called the Milky Way Galaxy. The Milky Way is shaped like a disk with concentrations of brighter stars and clouds of gas shaped like a whirlpool. The Milky Way is only one galaxy of many billions of galaxies in the universe.

In order from smallest to largest, some important terms to remember are: planets and stars, solar systems, galaxies, the universe. Each term is a component of the next. (Aside from planets and stars which are both different components of solar systems.)

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