  Offering space-based Internet services with mega-constellations of low Earth
orbit (LEO) satellites is a promising solution to connecting the unconnected.
It can complement the coverage of terrestrial networks to help bridge the
digital divide. However, there are challenges from operational obstacles to
technical hurdles facing the development of LEO satellite access. This article
provides an overview of state of the art in LEO satellite access, including the
evolution of LEO satellite constellations and capabilities, critical technical
challenges and solutions, standardization aspects from 5G evolution to 6G, and
business considerations. We also identify several areas for future exploration
to realize a tight integration of LEO satellite access with terrestrial
networks in 6G.
