In this column from the AAS Historical Astronomy Division, Michael E. Marotta writes about the discovery of the 21-cm emissions of interstellar hydrogen.

The AAS Laboratory Astrophysics Division (LAD) is honoring Vincent Esposito for his PhD thesis at the University of Pennsylvania, The Spectroscopy, Photochemistry, and Dynamics of Atmospheric and Astronomical Molecules.

AAS Publishing is launching a special series of AAS Journal Author video chats in collaboration with Black in Astro for BlackSpaceWeek to highlight the work of several incredible Black astronomers.

AAS members Sara Seager and David Charbonneau will share the $1 million prize for discoveries of exoplanets and the characterization of their atmospheres.

The grace period for membership ends soon. If you don't renew by Friday, 8 March, your AAS membership will be suspended and renewals after that date will incur a $10 late fee.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.

AAS Nova provides highlights of recent articles from AJ, ApJ, ApJ Letters, ApJ Supplements, PSJ, and RNAAS to inform you about discoveries you might otherwise overlook.