6 ms·

I think they were referring to metals like carbon and oxygen, but I’m sure Led Zeppelin is important too.

• 1-more 1y ago
  Carbon and Oxygen are not metals though, right?
  • hollerith 1y ago
    According to the definition used by astronomers, all elements heavier than hydrogen and helium are metals.
    • 1-more 1y ago
      fascinating!!
    • GuB-42 1y ago
      A good reason for recycling centers to hate astronomers.