In sentence below the clause “To get…” is an adverbial clause or an adjectival clause that modifies Mission Control?

To get the astronauts home safely, Mission Control has to keep them alive and on the right course for every minute of that journey.

Question

In sentence below the clause “To get…” is an adverbial clause or an adjectival clause that modifies Mission Control?

To get the astronauts home safely, Mission Control has to keep them alive and on the right course for every minute of that journey.

Answer

Pay attention -- there is no adjective in "To get the astronauts home safely", so how can it be an adjectival clause?

Answer

As it answers the question 'why?', it's an adverbial clause.