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In the past few years CubeSats revolutionised space applications in low Earth orbit, levelling the playfield and opening space to commercialisation, especially for smaller and medium companies. While their benefits are undeniable, a significant drawback is their potential to generate additional space debris. As the requirements for orbital lifetime and sustainability become more demanding, new challenges will arise for CubeSats. ESA is looking for innovative ideas to make the versatile satellites more sustainable.