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.
How many stars can you see at night? There are billions of stars just in our galaxy and it is estimated that in the visible Universe, there are about 200 â 300 billion large galaxies. It gives a HUGE amount of stars â approximately 10^24. But how many of them can we observe with the naked eye?