Terraforming is the process of modifying a planet or moon's environment to make it more Earth-like and suitable for human habitation. This can involve altering the atmosphere, temperature, and surface conditions to support life. Scientists often consider planets like Mars or moons like Europa for potential terraforming projects. The concept of terraforming has been popularized in science fiction, but it also raises important scientific and ethical questions. Techniques might include introducing microorganisms to produce oxygen, creating artificial oceans, or using greenhouse gases to warm a planet. The feasibility and implications of such projects are still subjects of ongoing research.