Which star is 100 times brighter than the sun but has a surface temperature about 2,000 k cooler than the sun

Which type of neuroglia is found outside of the brain?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?

Blank is a rock with a find dark texture that makes up the oceanic crust