Alexandra Witze wrote "… scientists who participate in the agency’s Mars missions might no longer design and build their own highly specialized payloads to explore the red planet." The word"payload" refers to the things the spaceship could carry.
What does "highly specialized" mean in this context?
(Be careful, spelling matters!)
What does "international" mean?
"The agency’s long–running string of spacecraft is winding to a close, and international and commercial interests are on the rise."
Which phrase best describes what "[t]hroughout the 2000s" means?
In the same quote, what is another word that means the same as "sustained" in this context?