Mars
Neptune is a gas planet, thus it has no solid surface (that we've seen yet), thus no canals.
Mars. The Italian astronomer Schiaperelli thought he could see "canali" (channels, not actually canals) on the planet's surface. Percival Lowell also "saw" them, and wrote an extensive book on what Mars was probably like because of the "canals". It was determined years later, and proven by the Mars orbiters and landers, that the "canals" were an optical illusion to earth-bound viewers. They don't exist.
I believe it was Mars. It was promoted by Percival Lowell See related link
Mars is the planet famous for its canals. However, it's important to note that these "canals" were a mistranslation of the term used for natural features on Mars and are not actual constructed waterways.
Earth
MARS
For a time in the late 19th and early 20th centuries, it was erroneously believed that there were canals on Mars. These were a network of long straight lines in the equatorial regions from 60° N. to 60° S. Lat. on the planet Mars. They were first described by the Italian astronomer Giovanni Schiaparelli during the opposition of 1877, and confirmed by later observers. Schiaparelli called these canali, which was translated into English as "canals". The Irish astronomer Charles E. Burton made some of the earliest drawings of straight-line features on Mars, although his drawings did not match Schiaparelli's. By the early 20th century, improved astronomical observations revealed the "canals" to be an optical illusion, and modern high resolution mapping of the Martian surface by spacecraft shows no such features.
The Polar ice caps , its red colour and the dark lines that were once thought to be canals. see realted link for picture
its never was a planet, people just thought it was i hope that helped
Earth. This question looks like it's about hundred years out of date. Some people did think the markings on Mars were canals, but that was long before our present excellent pictures of Mars.
As the planet Jupiter has no surface, the temperature of the "surface" cannot be measured.
Mercury is sometimes referred to as the "fossil planet" because it is thought to resemble the rocky composition of the early solar system without significant geological activity to cover up its ancient surface features.