The launch site isVandenberg afb, Florida. Construction started in France, then was moved to the NASA jet propulsion lab in Pasadena California.
It will launch a lander to land on mars and drill a hole to study the interior of the planet. They are doing this to learn more about the inside of the planet mars.
By using sophisticated geophysical instruments, InSight will delve deep beneath the surface of Mars, detecting the fingerprints of the processes of terrestrial planet formation. The original launch date was going to be march 2016, but it was canceled. There was a failure of an instrument called the seismic experiment for interior structure or seis. The seis was provided by France's Centre National d'Etudes Spatiales.