AUTHOR=Aglietti Guglielmo S. TITLE=From Space Debris to NEO, Some of the Major Challenges for the Space Sector JOURNAL=Frontiers in Space Technologies VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/space-technologies/articles/10.3389/frspt.2020.00002 DOI=10.3389/frspt.2020.00002 ISSN=2673-5075