NASA is preparing its next major space telescope, called PRIMA, which will observe the universe in the far infrared spectrum. This type of light, invisible to the human eye, is emitted by the coldest objects in space, such as gas and dust clouds where stars and planets are born. PRIMA will be part of a new category of NASA missions called "Probe Explorers," which lie between small, budget-friendly satellites and large observatories like the James Webb Space Telescope. The goal is to tackle ambitious scientific questions with a balance of cost, speed, and technical innovation. PRIMA will join the Nancy Grace Roman telescope, launched in late 2023, and the Hubble Space Telescope, which has been operating for over 36 years. These three form NASA's flagship observatories, each with distinct capabilities. While Hubble and Roman focus on visible and near-infrared light, PRIMA will specialize in far-infrared wavelengths, allowing it to see through dense dust clouds that block visible light. This will help scientists study the hidden processes of star and planet formation, as well as the evolution of supermassive black holes at the centers of galaxies. The telescope's design is highly specialized to function in the far infrared. Its 1.8-meter mirror will be cooled to several hundred degrees below zero to avoid interference from the telescope's own heat. It will use superconducting detectors to capture faint signals from distant objects. PRIMA is expected to launch in 2033 and operate for five years. The Jet Propulsion Laboratory (JPL) in California will lead the mission, with support from the French space agency, CNES. Far infrared light is crucial for observing the universe's coldest and most obscured regions. From Earth, most of this light is absorbed by water vapor and other atmospheric components, making ground-based observations difficult. By placing PRIMA in space, scientists can avoid these atmospheric limitations and capture more detailed and stable data. This will allow researchers to study not only the formation of stars and planets but also the chemical composition of exoplanet atmospheres and the evolution of galaxies over cosmic time. PRIMA is currently in Phase B, where engineers will refine its design and develop the necessary technologies before moving toward full construction.