It is clear (SE)^2 is about Space Exploration. Being a relatively new site here on SE, some questions may have been posted on other SE sites. Amongst others, Where is our demarcation line between Space Exploration and Physics? is a related question, albeit not identical to the intent here.
If a question posted here on (SE)^2 was covered on another SE site, is it acceptable to link the two questions across forums? This is not about a cross-post, merely a link to a question on another SE site.