Romantics might like to think of themselves as being composed of stardust. Cynics might prefer to think of themselves as nuclear waste.

We are 13.7 billion light-years from the edge of the observable universe, That's a good estimate with well-defined error bars, Scientists say it's true, but acknowledge that it may be refined, And with the available information, I predict that I will always be with you.

All that was required to measure the planet was a man with a stick and a brain. In other words, couple an intellect with some experimental apparatus and almost anything seems achievable.