What is 建设 in ...以期更好地展现我国航天建设的辉煌成就...?
In mainland China, 建设 can have the meaning of "cause", similar to 事业. It is often said that


  在社会主义建设的道路上…
  On the road of the construction (cause) of the socialism society...


From a random online dictionary from Google:


  建设 — 创建新事业或增加新设施
  (Construct new causes or add new equipments)


So in your case, 我国航天建设 is an elliptical phrase, where 事业 is omitted, which should look like


  我国航天事业的建设
  The construction of our cause for spaceflight  


In practice, you can translate 建设 into "cause" or "the construction of xxx project" (我国航天工程) depending on the context.