In this week's Ask an Expert on Facebook Live, join curator David DeVorkin for a walking tour of the Exploring the Universe gallery, highlighting how four women made contributions to astronomy over time (18th through 20th centuries) and how their roles changed over time. 

Tune in on our Facebook page. 

Every Wednesday at 12:30 p.m. we will go live on the National Air and Space Museum Facebook page with an Ask an Expert talk. We’ll select a different aviation or space topic each week, and a Museum staff member will discuss the history, stories, or personalities related to a specific artifact or exhibition in the Museum. Tune in on Facebook Live each week to join the talk and ask our experts questions.