2 Energy from the Sun
The Sun supplies the Earth with energy: radiation streams out at 385 trillion trillion W (385 followed by 24 zeros!). But as the Earth is 150 million km from the Sun (on average), it intercepts only a tiny fraction of this energy.
It’s like a garden sprinkler or fountain. A large flow of water is supplied to spray out in every direction, but each of the surrounding plants – or, in the case of the photograph of the unusual fountain in Figure 1, birds – receives only a small part.
How many 10 W compact fluorescent light bulbs would be needed to create the same energy output as the Sun?
The number of light bulbs needed will be the Sun's output, divided by the output of a single light bulb: so the answer is 38.5 trillion trillion. This is similar to the highest estimates for the number of stars in our Universe (1 trillion trillion).