Pablo and Hugo live on the same street. Pablo stands in front of his house and sounds an air horn and raises his arm at the same time. Hugo stands in front of his house and starts a stopwatch when he sees Pablo's arm go up. He stops it when he hears the air horn. The stopwatch shows a time of 1.2 seconds. The speed of sound is about 340 m/s. About how far apart are their houses?

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.