We know Earth’s exact spot in the universe thanks to a mix of astronomy and technology. First, we figured out we’re the third planet orbiting the Sun, which is part of the Milky Way galaxy—a giant spiral of stars. Then, astronomers mapped out the Milky Way itself, realizing it’s in a smaller arm of the galaxy called the Orion Arm. Beyond that, we know the Milky Way is part of a group of galaxies called the Local Group, which is in an even bigger structure called the Virgo Supercluster. Using telescopes and satellites, scientists also track Earth’s position relative to other stars, galaxies, and cosmic landmarks like quasars. But can we be sure we're right about the position of our Earth?

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