NASA Science Editorial TeamMay 5, 2018CategoriesInSight (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, 2018CategoriesInSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport)Jet Propulsion LaboratoryMarsPlanetary SciencePlanetary Science Division