Speed of sound.. if i am travelling at 1/2 the speed of sound, and there are sounds coming from behind me and in front of me. i understand they will sound at different frequencies to me, but will i still detect them as both travelling at the same speed?

If they were beams of light, then you'd see both beams pass you at
the "speed of light", no matter what your own speed happened to be,
and no matter what the speed of the sources happened to be.

But since they're beams of sound, The sound from the source behind you
will pass you at 0.5 times the "speed of sound", and the one from the source
in front of you will pass you at 1.5 times the "speed of sound".

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.