We have to way to know it it's actually the fastest and farthest object: A 1957 nuclear test was conducted underground, but the scientists decided to cap the bo

We have to way to know it it's actually the fastest and farthest object: A 1957 nuclear test was conducted underground, but the scientists decided to cap the borehole with a sizable concrete and metal plug. The nuclear explosion may or may not have caused said plug to reach space - the data from the cameras indicate it had at least 6 times the needed escape velocity, but it is difficult to estimate whether it would completely disintegrate or if enough of it would survive the atmosphere and whether it would "count" https://nuclearweaponarchive.org/Usa/Tests/Plumbob.html https://nuclearweaponarchive.org/Usa/Tests/Plumbob.html (look for Pascal-B)