NASA Science Editorial TeamMay 5, 2018 6:46AMCategoriesInSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport)Jet Propulsion LaboratoryMarsPlanetary SciencePlanetary Science Division T-4 Minutes and HoldingThe launch countdown has entered a planned T-4 minute hold. This hold will last 15 minutes. There are no weather constraints. NASA Science Editorial TeamMay 5, 2018 6:46AMCategoriesInSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport)Jet Propulsion LaboratoryMarsPlanetary SciencePlanetary Science Division