Dimensional Rift

Dimensional Rifts are fractures in the multiverses space.

Nature
Studying these rifts is almost impossible. They have no mass, but can be located through fractured light from the other side. They are bound to a medium-strength centre of gravitational attraction, such as a planet, and will move with that body while they last. It seems they cannot live past twenty four hours, but sometimes even less than that.

They are the entrances of tunnels through the crossverse. An object entering one almost instananeously appears at the other side, and so do air, light, radiation, and heat. Tunnels are of multiple sizes, most commonly 3m across, and spherical.

Linkage
These Rifts usually connect planets with similiar properties. It is theorised that microbes travelling through have seeded life on other worlds. However, planets with drastically different conditions can be majorly affected by these links.

There have been examples of Rifts connecting to stellar surfaces or protoplanetary disks. The reasons for this are unknown.

Travellers
Curious lifeforms are often drawn to these, and generally travel through them.