but photos like this there is no reason for that not a single star will not see:
Clouds cleared for a while tonight and nice 49% Moon which reminded me of tarkus' Earth image, so thought I'd post some examples of the effect "exposure" has on an image.
As we all know exposure is determined by ISO, shutter speed, and aperture. All the below images are ISO 800 and f/4.5. I have varied shutter speed to attempt to get some stars into the image. Focal length is 86mm.
So first up, with shutter speed 1/400 sec. This gives a nicely exposed Moon with lots of crater detail (see red inset), but of course the shutter speed is too fast to pick up stars.
Let's try a shutter speed four times longer, 1/50 sec:
Unfortunately we have now over-exposed the Moon, leaving only a little detail around the terminator. Again though, stars are not visible.
Finally, let's go for a really long shutter speed of 2 seconds (100 times longer than last time).
We have now totally blown the Moon out and lost all detail. But finally, we can see (a few) stars!
This illustrates why that photo of the Earth has no stars in it, to get the correct exposure for the Earth means using a fast shutter speed (for a given ISO and aperture) which means the faint stars are under-exposed and thus not visible.
Hope that helps you understand exposure now tarkus.