WONDER #1830: Where Is the Oort Cloud?
Question 1 of 3
Scientists theorized the existence of the Oort Cloud based upon their observation of what?
Question 2 of 3
Long-period comets have orbits that last over how many years?
Question 3 of 3
The Voyager 1 space probe exiting the solar system will not reach the Oort Cloud for how many more years?
Check your answers online at https://www.wonderopolis.org/wonder/where-is-the-oort-cloud.