Question

What is the length of a year and day on Pluto?

Answer 1

Hint: To explain, a day on a planet is what time it needs to spin around fully and make one complete revolution around its axis like Earth needs $24$ hours to complete one revolution about its axis, but every planet possesses a different rotational velocity. As Pluto revolves more slowly than Earth, its day is long.

Complete step-by-step solution:
Pluto spins slowly than Earth, it is having a long day because Pluto has a different rotational speed than Earth. Pluto orbits around the Sun in $248$ years and turns itself in $6.39$ days. It takes $6.39$ days, i.e., six days, nine hours, and thirty-six minutes to make one rotation, so this is how a day is long on Pluto.
Pluto is so far away from the Sun that the amount of sunlight that reaches Pluto is much smaller than what we get on Earth. It has been observed that the Sun would seem about $1000$ times fainter than it seems on Earth. The Sun would seem more similar to other stars than a big yellow circle, although the Sun would be the sky's brightest object. However, it is not wholly dark on Pluto. Pluto has a light atmosphere; that atmosphere would spread the light, but not sufficient to make a bright sky as we observe on Earth or Mars.
Pluto has very long seasons as Pluto's year is $248$ years long compared to most planets. Planets execute circular revolutions around the Sun. However, planet Pluto's path is very different. It is hugely elliptical, moving around the Sun. Moreover, Pluto's orbit is deeply sloped, going at an angle of ${17}^{\circ }$.
Additional Information: - NASA states that Earth's illumination matches Pluto's high noon at a particular time near dawn and dusk each day. NASA has a "Pluto Time" website wherever we can fill our location and obtain what time of day we could experience the same amount of light on a clear day that Pluto is getting.

Note: Pluto moves around the Sun in an elliptical orbit. Pluto goes as close as $4.4$ billion km from the Sun at its perihelion (closest point). At its aphelion (further point), Pluto is at a distance of $7.4$ billion km away from the Sun. Accordingly, the amount of sunlight differs during Pluto's long year depending on its close or far to the Sun.