How to pronounce "therell"

barrier the ingredients are there we

barrier the ingredients are there we just don't know how they combine to

just don't know how they combine to

just don't know how they combine to create life and presumably there'll be

create life and presumably there'll be

create life and presumably there'll be worlds on which life doesn't start the

worlds on which life doesn't start the

worlds on which life doesn't start the development of technological

development of technological

development of technological civilization is a third barrier there'll

civilization is a third barrier there'll

civilization is a third barrier there'll be worlds where life doesn't give rise

be worlds where life doesn't give rise

be worlds where life doesn't give rise to Advanced Technology communication

to Advanced Technology communication

to Advanced Technology communication across space that's a fourth barrier

across space that's a fourth barrier

across space that's a fourth barrier there'll be worlds where for whatever

there'll be worlds where for whatever

there'll be worlds where for whatever reason civilizations either stay silent

reason civilizations either stay silent