  We present our analysis of the narrow emission lines produced in the plasma
regions within the bright active galactic nucleus of NGC 4151, from an ORBYTS
research-with-schools public engagement project. Our goal was to test whether
the properties of these plasma regions changed between XMM- Newton observations
spanning 15 years from 2000 to 2015, by measuring the outflow velocities and
distances. From this study, we found that NGC 4151 has at least two to three
plasma regions. There is no evidence of the outflowing wind properties changing
as the velocities and distances are consistent throughout the observations.
