Part 5/10:
The crux of exploring the Oort Cloud lies in the challenge of visibility. Objects within the Oort Cloud are incredibly faint and hard to detect because they are so far away—practically a thousand times dimmer than those in the Kuiper Belt. While we theorize the existence of numerous small bodies, our current technological capabilities limit our understanding of this region to theoretical models rather than empirical data.
Notably, a hypothetical scenario of a twin Earth and Sun located in the Oort Cloud would be nearly impossible to observe. Hence, while we can postulate their mass and characteristics, the reality of these bodies remains largely hidden.