Of course, it was only a suspicion.
Beyond that, humanity had no other favorable evidence. In fact, the data returned by the probes had not only been sent to humanity but also copied and forwarded to the other civilizations of the Star Alliance. Yet none of them were as suspicious as humanity.
Their reactions were the exact opposite of humanity's. Every one of them was cheering with joy.
Crimson Flame Civilization in particular, since they happened to be carrying out the vanguard reconnaissance mission this time. They were happy because the planet was lush with springlike vitality.
Yes, according to the information sent back by the probes, this planet was indeed a Life Planet. Whether it possessed Sentient Life still required further investigation, such as a landing survey. But observations from space had already confirmed that it was a planet with life.
Viewed from space, its surface displayed a beautiful deep blue, interspersed with many purple regions. According to the preliminary survey results, the blue was ocean formed by accumulated water, while the purple was vegetation on land.
The planet's orbit was excellent, lying precisely within the Habitable Zone as defined by humanity's classification of living environments. In such an orbit, water could exist in two forms at once: solid and liquid.
Oh, and as water vapor too.
Layers of clouds wreathed the planet like misty mountains and seas, making it look dreamlike, like a celestial paradise.
Humanity's definition of a Habitable Zone certainly could not encompass every environment in which life in the universe might survive, but it was unquestionably the optimal environment for water to exist in solid, liquid, and gaseous states. Such an environment was also best suited for all kinds of carbon-based life to emerge.
Furthermore, blue planets were not unique to Earth. They were a