Planets are like our brothers and sisters. We have given them names and treated like they are alive.
Venus is the closest at 127 light seconds while Neptune is the farthest at 4.1 light hours
Planetary Nebula is a look into the future of our sun. Simply put they are stars about the sun's size that have reached the end of their fuel supplies. You have to be "quick" to see these as they only last about 10,000 years before they fade away.
They are scattered about the Milky Way and are fairly rare at about one in 66,000.