Momoshiki's Planet

In Boruto: Naruto the Movie, the majority of the movie takes place in an unknown planet where Momoshiki and Kinshiki hailed from. The planet itself located in an unknown star system in certain corner of the universe.

Known Access
There are some ways to access the planet to the Earth: Both of the techniques use the power of Rinnegan.
 * With a portal created through an unspecified Space–Time Ninjutsu utilised by Momoshiki and Kinshiki.
 * With a portal created through an unspecified Space–Time Ninjutsu utilised by Sasuke.

Environment
The planet itself from outside seems to have a thick and cloudy atmosphere. The clouds are very thick and fully engulfed all of the planet's body and made it very hard to penetrated by the system's host star's sunlight, caused the planet sky is in perpetual gloom in black - red tone colour as in twilight.

Underneath the planet atmosphere, the planet surface are harsh, barren, and lifeless environment with a dull reddish landscape consisting of many craters, canyons, highlands, and mountains without any remarkable features. It also seems to be same than the earth in real life, having earth-like gravity and an oxygen-enriched atmosphere, but lack of any trace of water.

Despite its extreme environmental conditions, the planet still capable to sustain specific lifeforms. It host a Shinju which appears much older than Earth's, which was later destroyed due to Kinshiki's actions. Some Ōtsutsuki appears having arrived to there at some unspecified time, and able to gain descendants for generations, and eventually only Momoshiki and Kinshiki survived.

Trivia

 * Being able to host a Shinju in there, its unknown if this planet in the past also host a certain sentient being and also have and shared same dark past like the Earth, where countless battles also plaguing here and the blood of deceased spilled there, leading to the planet's Shinju creation.