Spatial passages generally appear on the surface or underground.
Rarely are they located in the air.
As for space, at least Chen Shouyi had never seen one before. He originally thought such spatial passages existed only on Earth, but now it seemed it was merely an effect of a celestial body's gravity, or perhaps...
Chen Shouyi thought to himself:
"Intentionally appearing near celestial bodies!"
He looked into the distance at Mars: "There must be many spatial passages there too."
"Tamu..."
He murmured, losing any remaining hope.
"If it were to devour, the entire Earth might be torn apart."
...
Inside a classroom at Beijing University.
A middle-aged professor was giving a lecture to his students:
"In current mainstream academic circles, spatial passages are known as wormholes.
