What is Neptune's terraforming?

Answer 1

Terraforming a planet is the process of modifying it to make it like Terra (Earth) although it is normally used to simply refer to making the atmosphere breathable by higher animals and plants.

With this definition, Terraforming Neptune would be giving it an atmosphere that humans can breathe.

That being said, it's impossible to terraform Neptune, because it is a naturally stormy gas giant with winds raging up to 2,000mph, very little sunlight for food or energy, is too far from the sun to hold liquid water and has an exposed molten core that you'd fall into and be vaporised by if you try to stand on the planet.

Answer 2

Terraforming is the theoretical process of altering a planet's environment to make it more hospitable to human life. In the case of Neptune, this would involve a complex and currently hypothetical process of modifying its atmosphere, temperature, and other conditions to support life. Due to the extreme distance, temperature, and conditions on Neptune, terraforming the planet would be far beyond our current technological capabilities.