Possible Clues:

• Studying what's driven up temperature in part of garden
• Works out October in Kerry for missile research
• Star may be discovered by this technology item which spices up track
• Aerospace science
• Study of weapons finally kept in garden
• Wernher von Braun’s field
• Garden feature takes time, it's supposed to be difficult
• Study of space vehicles
• Science of missiles
• Form of technology -- something hard engineers initially attempt