Join us below at 4:30 P.M. Eastern time on Thursday, July 12, for a live 30-minute online chat with physicist Michael Tuts of Columbia University, who will provide context for last week's landmark announcement from CERN, a Switzerland-based lab for particle physics, about the discovery of a particle that could well be the Higgs boson. We invite you to submit questions in advance in the comments section at the bottom of this page.

Tuts, the U.S. operations program manager for the ATLAS detector at the LHC, will answer your questions during the chat about what comes next—how physicists will attempt to confirm that the new particle is indeed the Higgs, and how its properties may point to new physics. We will turn on the capacity to log in to the chat box below mid-day.