Final answer:
EPPS stands for Energetic Particle and Plasma Spectrometer, a scientific instrument used to study energetic particles and plasma in space.
Step-by-step explanation:
In the context of the Energetic Particle and Plasma Spectrometer, EPPS stands for Energetic Particle and Plasma Spectrometer. This instrument is part of a spacecraft's payload, designed to measure the composition, distribution, and flow of plasma (ionized gas) and energetic particles throughout a planet's magnetosphere or in the solar wind. By analyzing the energy spectra of these particles, scientists can gain vital insights into space weather phenomena, the behavior of solar and planetary magnetic fields, and the processes contributing to radiation in space.