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Because the sound waves are being observed by the people that are there and it is not empty as in an empty place the sound waves will come back to you.
Scientists gather a new evidence like let me say for example jj Thompson said that an atoms is the least particles of an element but according to our definition an atom is the smallest particles of an element so you see
The word you are looking for is <em><u>refraction. </u></em> Reflection is when 100% of the light is bounced back, refraction, however if when light <em>bends</em>, or, changes wavelengths.
Stars and planets because of there gravitational pull but planets are the most likely out of all of them because planets are closer together than stars so they pull each other in