We provide a nonspecialist overview of the current state of understanding of the structure and origin of our Solar System's transneptunian region (often called the Kuiper Belt), highlighting perspectives on planetesimal formation, planet migration, and the contextual relationship with protoplanetary disks. We review the dynamical features of the transneptunian populations and their associated differences in physical properties. We describe aspects of our knowledge that have advanced in the past two decades and then move on to current issues of research interest (which thus still have unclear resolution).

▪	The current transneptunian population consists of both implanted and primordial objects.
▪	The primordial (aka cold) population is a largely unaltered remnant of the population that formed in situ.
▪	The reason for the primordial cold population's current outer edge is unexplained.
▪	The large semimajor-axis population now dynamically detached from Neptune is critical for understanding the Solar System's history.
▪	Observational constraints on the number and orbits of distant objects remain poor.

中文翻译：

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海王星空间

我们提供了对我们太阳系海王星区域（通常称为柯伊伯带）的结构和起源的当前理解状态的非专业概述，突出了对小行星形成、行星迁移以及与原行星盘背景关系的看法。我们回顾了跨海王星种群的动力学特征及其相关的物理特性差异。我们描述了我们在过去二十年中取得进步的知识的各个方面，然后转向当前的研究兴趣问题（因此仍然没有明确的解决方案）。

▪	当前的跨海王星人口由植入的和原始的物体组成。
▪	原始（又名冷）种群是原位形成的种群的大部分未改变的残余。
▪	原始寒冷种群目前外缘的原因不明。
▪	现在与海王星动态分离的大型半长轴种群对于了解太阳系的历史至关重要。
▪	对遥远物体的数量和轨道的观测限制仍然很差。