Capítulo 130: CXXX. Landscapes of Pink and White.

Pluto's pulling strength was not even one-hundredth of the strength that the four gas giants possessed and used to attract Cookie's and the ancient man's masses towards themselves, so they could descend on the mini-planet lightly and without the need of compensating in their glide by pulling their bodies back as they fell. 

Cookie's naked feet touched the smooth snow, and her body barely sunk on it, as the gravity was too low in the planet to generate enough pressure to compact the nitrogen snow down to the rocks below. The man descended, and not even his apparent heavyweight had much effect on it.

It was daytime on the part of the planet they decided to land —being, of course, the giant heart. According to the man, a day in Pluto lasted up to more than 6 earth days, a quantity that made Cookie's head spin.