5 ms·

It could be, but it would be the size of a tennis ball. See https://news.ycombinator.com/item?id=28167058 https://news.ycombinator.com/item?id=28167058

• pitaj 5y ago
  According to my calculations it would take more than 10^53 years to decay.
  • scatters 5y ago
    It won't even start to decay until space expands enough that it's warmer than the cosmological background, not that that's more than a rounding error to your calculation.