Earth receives 430 quintillion joules from the Sun every hour.
Why it is true
This energy is enough to power human civilization for thousands of years — if we could capture it all.
Source: NASA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.