It seems like you're asking about how "affect" impacts life on planets. However, "affect" is a verb meaning "to have an influence on," and it's not a concrete thing that we can measure or study in the way we study, for example, gravity or temperature.

To understand how something impacts life on planets, we need to specify what that "something" is.

For example, you might be asking:

* How does gravity affect life on planets? Different planets have different gravitational forces. This impacts the size and structure of organisms, the way they move, and the types of environments they can inhabit.

* How does the presence of water affect life on planets? Water is essential for life as we know it. The availability of liquid water on a planet is a crucial factor for the development and survival of life.

* How does the presence of an atmosphere affect life on planets? Atmospheres protect life from harmful radiation and help regulate temperature. The composition of the atmosphere also impacts the types of life that can thrive on a planet.

Please clarify your question by specifying what "affect" you're interested in. Once you do, I can give you a more detailed explanation of how it impacts life on planets.