Summer One.
It was a bright star of summer, rising in the east and setting in the west alongside the moon. Its path through the sky was highly unusual: during the warm season it was in the east, while during the Ice Age it was in the west. Such a chaotic trajectory revealed its extraordinary nature.
Only a planet could have such a peculiar astronomical path.
After all, most stars in the sky were fixed stars in the distant cosmos, nearly motionless relative to the Dragon Sleep Continent's solar system.
Thus, no matter when they were observed, the positions of fixed stars remained essentially unchanged.
Only planets constantly shifted their positions relative to the Dragon Sleep Continent, though calculations could barely predict their short-term orbits.
As early as a month ago, Sullivan had led his team in predicting Summer One's trajectory.
And tonight, Dagger Mountain Observatory had once again captured Summer One, which was indeed moving along its predicted orbit.
"Announce it, Teacher!" the students clamored. "It's a planet just like our Dragon Sleep Continent. Maybe the humans up there are also using Astronomical Telescopes to look at us!"
Sullivan was equally excited.
Yet he still waved a hand. "No rush. We need to keep observing for a while longer. And even if Summer One is a planet, don't place too many expectations on it. According to the theoretical guidance provided by Lord Russell, I suspect it isn't within the habitable zone."
"Yes, if it isn't in the habitable zone, Summer One's climate must be incredibly harsh. It simply couldn't nurture humans like us," one student agreed.
But another student said, "Maybe it isn't suitable for humans, but perhaps it suits Frost Trolls. Teacher, Summer One might be the world of the Frost Trolls invading us. It is farther from