New Space refers to the recent opening-up of the space sector to private companies. The liberalization of space activities, which coincides with the digital evolution of the economy, is associated with the rapid expansion of the downstream space segment, i.e., space-related commercial products and services. In this paper, we address the issue of evaluating the size of the downstream space sector in light of New Space characteristics. We describe New Space as a structural transformation of the space sector associated with the entry of private companies and investors, the adoption of new business models, and the reorientation of space agencies towards market-oriented policies. In this specific context, we claim that assessing the economic weight of downstream space activities is of prime interest. Our review of space sector evaluations shows limitations of the existing methodological tools when identifying and evaluating downstream activities. We conclude this work by outlining theoretical issues regarding New Space and the expansion of space-based services markets to be considered for a new evaluation methodology.

新空间指的是最近太空部门向私营公司开放。空间活动的自由化与经济的数字化发展相吻合，与下游空间部分（即与空间相关的商业产品和服务）的快速扩张有关。在本文中，我们解决了根据新空间特征评估下游空间部门规模的问题。我们将新空间描述为与私营公司和投资者的进入、新商业模式的采用以及空间机构重新定位为以市场为导向的政策相关的空间部门的结构转型。在这种特定情况下，我们声称评估下游太空活动的经济权重是最重要的。我们对航天部门评估的审查显示了现有方法工具在识别和评估下游活动时的局限性。我们通过概述有关新空间和天基服务市场扩展的理论问题来结束这项工作，以考虑采用新的评估方法。