JSC/NASA
When was the first sunrise on Earth?
Eric Kvaalen
Les Essarts-le-Roi, France
That is simply a question of how you define “Earth“. Assuming that our planet came together gradually as dust and particles slowly agglomerated, at what point do we start calling a particular chunk “Earth”?
Maybe we should say it was the first chunk that was bigger than anything that subsequently fell onto it. In any case, it was always rotating, so as soon as we can call it Earth, the first sunrise on Earth occurred.
Hillary Shaw
Newport, Shropshire, UK
For a sunrise, you need a transparent…
