According to the passage, the inhabitants of Mars are interested in Earth for several reasons.
First, Earth represents a potential solution to their own planet's impending demise. Mars is described as being in a state of "secular cooling," with dwindling resources and inhospitable conditions. In contrast, Earth is portrayed as a warmer planet with abundant vegetation, water, and a fertile atmosphere. The Martians see Earth as a "morning star of hope" that offers a chance for survival and escape from their own planet's eventual destruction.
Second, the Martians perceive Earth as being populated by what they consider to be "inferior animals." They view the creatures inhabiting Earth, including humans, in the same way that humans view monkeys and lemurs. This implies a sense of superiority and an opportunity for dominance and conquest.
Lastly, the Martians possess advanced instruments and intelligences that allow them to observe Earth from a distance. They have a keen interest in Earth's conditions and its populous countries and seas. They recognize the potential for resources and the possibility of establishing their dominance over a planet that is still teeming with life.
Overall, the Martians' interest in Earth arises from the prospect of finding a habitable and resource-rich planet, the perception of Earth's inhabitants as inferior beings, and the opportunity for expansion and survival.

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