Final answer:
The sentence "Their is no way for the average person to know what it feels like to be in space" contains a grammatical error, and the correct sentence should be "There is no way for the average person to know what it feels like to be in space."
Step-by-step explanation:
The sentence "Their is no way for the average person to know what it feels like to be in space" contains a grammatical error. The correct sentence should be "There is no way for the average person to know what it feels like to be in space." The word "Their" should be replaced with "There." In this case, "There" is a pronoun that indicates the existence of something. The correct sentence structure helps to convey the intended meaning accurately.