Discussion Topic
A system is a group of parts that can be
considered one unit. Storm systems,
ecosystems, and our bodies are natural systems.
Cars and houses are human-made systems.
Choose an example of a system, and analyze
the energy flow through the system. Describe in
detail how energy enters the system, how energy
changes form while in the system, and how
energy leaves the system.

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.