Details. as.character and is.character are generic: you can write methods to handle specific classes of objects, see InternalMethods. Further, for as.character the default method calls as.vector, so dispatch is first on methods for as.character and then for methods for as.vector.
But this is the number of stars we can see from the entire Earth and we should remember that one hemisphere of Earth is always in daylight, so really only about 2500 to 5000 stars are visible at night from any given point on Earth.
Thereâs really no definitive answer to this question. No one has counted all the stars in the night sky, and astronomers use different numbers as theoretical estimates. Considering all the stars visible in all directions around Earth, the upper end on the estimates seems to be about 10,000 visible stars. Other estimates place the number of stars visible to the eye alone â surrounding the entire Earth â at more like 5,000. At any given time, half of Earth is in daylight. So only half the estimated number â say, between 5,000 and 2,500 stars â would be visible from Earthâs night side.