Quantum technologies are opening novel avenues for applied and fundamental science at an impressive pace. In this perspective article, we focus on the promises coming from the combination of quantum technologies and space science to test the very foundations of quantum physics and, possibly, new physics. In particular, we survey the field of mesoscopic superpositions of nanoparticles and the potential of interferometric and non-interferometric experiments in space for the investigation of the superposition principle of quantum mechanics and the quantum-to-classical transition. We delve into the possibilities offered by the state-of-the-art of nanoparticle physics projected in the space environment and discuss the numerous challenges, and the corresponding potential advancements, that the space environment presents. In doing this, we also offer an ab-initio estimate of the potential of space-based interferometry with some of the largest systems ever considered and show that there is room for tests of quantum mechanics at an unprecedented level of detail.

量子技术正在以惊人的速度为应用和基础科学开辟新的途径。在这篇透视文章中，我们重点关注量子技术和空间科学相结合带来的前景，以测试量子物理学以及可能的新物理学的基础。特别是，我们调查了纳米粒子的介观叠加领域以及空间中干涉和非干涉实验的潜力，以研究量子力学的叠加原理和量子到经典的转变。我们深入研究了投射在空间环境中的最先进的纳米粒子物理学所提供的可能性，并讨论了空间环境所带来的众多挑战和相应的潜在进步。在这样做时，