How old is old?

We find this notice below the shop window of Capigi the jeweller somewhat thought-provoking.  It refers to ‘old gold’.  We know what it means, of course.

But, as was discussed in the news in October, gold is created when neutron stars collide.   It’s not produced naturally on earth.  Indeed, most of the earth’s gold was accumulated while the planet was still molten 4.5 billion years ago.  Sadly, tantalising for us, the heavy metal then sank to the centre of the earth, out of reach.  The gold that we do find arrived here perhaps half a billion years later, when the now-solid planet was bombarded by gold-bearing meteorites.  So, the Capigi notice is spot on;  ALL gold on earth is 4 billion years old or thereabouts!

2 thoughts on “How old is old?

  1. Uhoh! Shhhh. Eye, should you have published that? There are some who will drill anywhere for anything that has pecuniary ‘value’… No matter what the actual cost to the planet we call home … Camberley? Yes, and more i.e Earth. Bye bye molten core, it was nice having you, I HOPE that our children (and their children …) don’t find they NEED you …

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.