Only 1 in 4.3 billion of the Sun’s photons are intercepted by the eight planets of our Solar System – the rest escape into interstellar & intergalactic space.

@Parag And how many by Earth? And if sunlight gives life, the ratio is even larger than sperm

@pratik Yes! You are right. There is about a thousand fold difference with your comparison.

Here are the diameters of planets in miles.
Mercury 3032
Venus 7521
Earth 7918
Mars 4212
Jupiter 86881
Saturn 72367
Uranus 31518
Neptune 30599
Pluto 1600

I think the area of planet catching sunlight should be proportional to the diameter. Earth accounts for only 3.2% of that total for all the planets including Pluto. So, that 4.3 billion should be multiplied by 30. That gives us -- 1 in 129 billion photons from the Sun captured by Earth.

@Parag It’s proportional to the square of the radius, as the area of a circle is pi*r^2. So the proportion captured by Earth is much much smaller. 😬