How astrophotographer Bray Falls helped to confirm the discovery of the Andromeda Oxygen Arc and what's next

The Andromeda galaxy is approximately 2.5 million light years from Earth and for the past 134 years, it has been the one of the most-observed galaxies by astronomers. This is why it's surprising that a recent oxygen nebula was uncovered by amateur astronomers Marcel Drechsler and Xavier Strottner - an arc almost as large as the galaxy itself, that hadn't been discovered until now. To verify their claim, the duo enlisted French amateur astronomer Yann Sainty to help out. United States-based amate...