35. A Star
It may seem like the most obvious thing one can possibly imagine. Yet a lot of the things we may discuss in this will be complicated and often rely on a star to even begin to work. A star of some type will offer heat and several other resources mankind will need to survive.
Without a star that will obviously be the sun to whatever planet we’re on, then life is simply not possible. Therefore, if we’re looking for things a planet needs to sustain human life, a star is one of the most important things among them.