NASA is developing starshade technology to Technology Readiness Level 5 within a directed activity called S5. The objective of S5 is to mature starshade technology to the level that exoplanet imaging missions, such as Starshade Rendezvous and HabEx, can begin the formulation phase. This paper outlines the S5 activity as a whole, to show how it closes all starshade technology gaps in a mutually consistent way. It serves as a companion paper to several other papers in this special section that report progress in specific starshade technologies.

中文翻译：

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美国宇航局的星空技术开发活动

美国宇航局正在一项名为S5的定向活动中，将星际阴影技术开发到技术就绪级别5。S5的目标是使星云技术成熟到一定水平，以使系外行星成像任务（例如Starshade Rendezvous和HabEx）可以开始制定阶段。本文概述了S5活动的整体情况，以展示它如何以相互一致的方式缩小所有星空技术的差距。它是本特殊部分中其他几篇论文的辅助论文，这些论文报告了特定星状阴影技术的进展。