The meaning of life.

We are the size of spores in this universe. To think that our life has any ability to keep the cosmos intact would mean that our planet is one small but necessary cog in the big machine. Even then, there are 6 billion of us, and a hundred thousand get killed everyday regardless of age, race or gender. So I suppose the meaning of life, in the broadest spectrum, is purpose. Every aspect to the meaning of life stems from having purpose.

  Every emotion felt, be it love or hate, humor or angst, happiness or anger, comes from a sense of purpose, or lack thereof. To have purpose is to have people who depend on you. Even if it's just yourself, sometimes that's enough. 
 I have people if life who love me. My parents, my friends, family members, etc. I know that while they could probably go on without me eventually, their lives would be significantly altered for a long period of time. And even if I didn't have those people around me, I still have an interest in life. I depend on myself to stay alive so that I can experience life. 
 Emotions are based on whether  purpose is felt or not. Elation and happiness ensues when it is felt, depression ensues when it's missing,  Relationships with other humans creates a sense of purpose inside of us. Having that sense motivates us to procreate, and make new generations that depend on us.
  But even if that interdependence is missing, even if those emotions aren't felt, that self dependence must be felt for there to be meaning. If able to depend on oneself, then that Nirvana of life meaning can still be  achieved.