Question

9.) what do life on other planets need to sustain life?

Explanation:

Based on our understanding of life as we know it, the core requirements are liquid water as a solvent, a source of energy (like stellar radiation or chemical energy), a stable environment with suitable temperatures, and essential chemical building blocks (carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur) to form complex biological molecules.

Answer:

For life (as understood from Earth-based biology) to be sustained on other planets, it would generally need:

1. Liquid water (a universal solvent for biological processes)
2. Access to a stable energy source (e.g., starlight, geochemical energy)
3. A range of essential chemical elements (carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, etc.) to build organic molecules
4. A relatively stable environment with temperatures that allow liquid water to exist, along with a protective atmosphere (to regulate temperature, shield from harmful radiation, and maintain pressure)