(I'm astrophysicist Neil deGrasse Tyson.) Some with billions, others with trilions of stars, these are the fundamental building blocks of visble matter in the universe; they come in many varieties including spiral, irregular & elliptical
I suggest that Mr. Moyers invite onto his show other scientists who have ... 
explain these things,at least science has some hypotheses about them... [DOC] [TLE] The Science of Reality | Scientific Terms and Definitions [PAR] Neil DeGrasse Tyson... https://t.co/R7rPVd6HIZ ... Apogee - The point in the orbit 
of the Moon or other satellite where it is ...