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In this column from the AAS Historical Astronomy Division, we focus on Henrietta Swan Leavitt who discovered the relation between the luminosity and the period of Cepheid variable stars.

The International Astronomical Union has joined a study on how to reduce the gap between men and women in the natural sciences and related disciplines. Please take their survey by 31 October.

The AAS and the American Geophysical Union have received a grant from The Kavli Foundation to advance exoplanet science through special sessions at both societies’ meetings and other activities.

Join an online hangout on Thursday, 12 July, at 3:00 pm ET to learn about to learn about how new X-ray observations of Eta Carinae, an exploding star system, show cosmic rays coming from colliding gas in the system.

The National Optical Astronomy Observatory is issuing a call for new survey proposals starting in the 2019A and B semesters. Investigators must submit letters of intent by 15 August 2018.

Proposals are invited from US-based AAS members for small grants to provide education-related mentoring and professional-development experiences for fellow members. Deadline: Sunday, 5 August.