Sheesh. Scientists may not know exactly how many planets there are but they can make a pretty damn good guess that there are more than a certain number, based on probability and the, as you say, the gravitational pull on the host star (from which they can work out whether it has planets orbiting it). And they can estimate how many grains of sand there are on earth fairly easily, though roughly. Find out what areas are covered in sand, depths etc. Grab a manageable section of sand. Count. Estimate.
on the bed front, my new bed is quite epic in its comfort and style qualities. I do hope you like my old one jul… haha hahaha bwaaaahahahahahahahahahahahah! 😀
I am Dirty Roger Rackham. Arr.