Oh. My. Word.

Sophia scribbled down as much as she could, and tried to listen to Professor Antares at the same time. She marked things down in her book that might be able to help her, but at the same time it was also very difficult. She'd have to re-read all of this later, probably twice. She knew Astronomy would be challenging, so working hard was her only option.

She had to think for a moment before she answered the Professor.

"We need microscopic life, Professor," she started. "Each habitable planet should start out that way, like Earth. Then the life forms evolved over thousands, or millions, of years. Along with being hospitable planets, they would need an ecosystem to support the life forms. As in water, plants..." She paused. "Well, depending on how those organisms develop. They might not eat the same way we do, or even breathe the same way..."

She paused again. Other students mentioned radio waves.

"I agree with radio waves. Once they're developed enough, they'd have to figure out resources for technology."

Maybe?