<i>Ask Astro</i>: Does our Oort Cloud overlap with Alpha Centauri’s?

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Does our Oort Cloud overlap with Alpha Centauri’s?

Carles Martinez

Barcelona, Spain

About 2,000 to 5,000 astronomical units (AU; where 1 AU is the average distance between Earth and the Sun) from the Sun lies the beginning of the Oort Cloud. For context, the Voyager spacecrafts — the human-made objects that have traveled farthest from our Sun — will cross this inner edge of our solar system in about 300 years. From there, the Oort Cloud stretches to about 10,000 to 100,

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