The day is the period of a planet's rotation, or how long it takes to spin once on its axis. Day might also refer to the fraction of its rotational period when an observer can see the Sun, as opposed to night, when the sun is below the horizon.
Pluto is no longer considered a planet.
Pluto is not being replaced, it is simply no longer regarded as a proper planet.
Mars is regarded as the fourth planet by the IAU.
Mars is regarded as the fourth planet by the IAU.
Pluto was regarded as the ninth planet, from it's discovery in 1930, until it's reclassification as a dwarf planet in 2006.
Ganymede is regarded as a moon because it orbits a planet. In order to be considered a planet it would have to orbit the sun.
I don't know of anyone who regards them as such.
Although it is no longer regarded as a planet, Pluto is the closest to that, taking about 248 years to orbit the Sun.
It was regarded by scientists as being "too small" to be classed as a planet. So they put it into the category of Dwarf Planets.
Pluto is not a star. It was never declared a star. It is a dwarf planet. It had been regarded as a planet, but due to its size and its orbit, it is now classified as a dwarf planet, but not a star.
This is planet Earth, so one Earth day is one day on this planet.
no,planet has a star day and night