Supposedly there are hundreds of billions of galaxies. Astronomers counted the galaxies in a small portion of the sky and multiplied by the balance of the sky.
The portion was about one-tenth the apparent diameter of the moon--about what you would see by looking through a drinking straw, or a twenty-six millionth of the whole sky. They found 10,000 galaxies:
They photographed that particular part of the sky because there were relatively few bright nearby stars in the way. Is there any reason to think that area had a greater density of galaxies than would be found in any other direction?
It is in the constellation Fornax, the furnace. (Fornax must not be confused with fornix, "arch" or "brothel" from which we get words like "fornicate.").
In any case, no matter how many galaxies there are, earth is probably the only planet with drinking straws.