Apython can detect thermal radiation from objects that differ in temperature from their environment as long as the received intensity of thermal radiation is greater than 0.60 w/m2 . your body emits a good deal of thermal radiation. assume that your body has a surface area of 1.6 m2 , a surface temperature of 30°c, and an emissivity e = 0.97 at infrared wavelengths. as we’ve seen, the intensity of a source of radiation decreases with the distance from the source. if you are outside on a cool, dark night, what is the maximum distance from which a python could detect your presence?

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.