AUTHOR=Agarwal Ramesh K. TITLE=Grand challenges in aerospace engineering JOURNAL=Frontiers in Aerospace Engineering VOLUME=3 YEAR=2024 URL=https://www.frontiersin.org/journals/aerospace-engineering/articles/10.3389/fpace.2024.1383934 DOI=10.3389/fpace.2024.1383934 ISSN=2813-2831