The unparalleled sensitivity of the NASA/ESA/CSA James Webb Space Telescope, operating in both near- and mid-infrared spectra, illuminates PMR 1, a comparatively unexamined nebula situated within the Vela constellation, with unprecedented clarity.
These Webb images showcase PMR 1, a celestial formation classified as a planetary nebula, situated approximately 5,000 light-years distant within the constellation of Vela. Image attribution: NASA / ESA / CSA / STScI / Joseph DePasquale, STScI.
PMR 1, also designated as IRAS 09269-4923, is a planetary nebula residing at an approximate distance of 5,000 light-years within the boundaries of the Vela constellation.
This celestial entity, initially brought to light in infrared wavelengths by NASA’s now-decommissioned Spitzer Space Telescope in 2013, is also recognized by the designation IRAS 09269-4923.
Webb’s sophisticated instrumentation has now unveiled intricate details, significantly enhancing the nebula’s striking resemblance to a human brain.
“The nebula exhibits discernible zones that appear to represent distinct stages of its evolutionary process — an outermost envelope of gas, expelled early on and primarily composed of hydrogen, and an inner, more structured cloud containing a composite of various gases,” the Webb astrophysicists conveyed in a public statement.
“Both Webb’s Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI) reveal a conspicuous dark band traversing the nebula vertically, which contributes to its brain-like morphology, separating what appear to be left and right hemispheres.”
“The resolution provided by Webb suggests that this demarcating band might be associated with an eruptive event or expulsion originating from the central star, a phenomenon typically manifesting as bipolar jets emanating in opposing directions.”
“Indications supporting this hypothesis are particularly evident at the superior aspect of the nebula in Webb’s MIRI imagery, where the internal gases seemingly show signs of outward propulsion.”
“Although a comprehensive understanding of this nebula remains an ongoing endeavor, it is definitively established that it is being shaped by a star nearing the conclusion of its nuclear fusion phase,” the research team elaborated.
“In their terminal stages, stars undergo the expulsion of their external layers. This process is remarkably dynamic and comparatively swift on a cosmic timescale. Webb has successfully captured a transient moment within this star’s senescence.”
“The ultimate fate of this stellar remnant will be contingent upon its progenitor mass, a parameter that has yet to be ascertained.”
“Should its mass be sufficiently substantial, the star will culminate its existence in a cataclysmic supernova explosion.”
“Conversely, a star of lesser mass, akin to our Sun, will continue to shed its outer constituents until only its dense core persists as a white dwarf, which will gradually dissipate its residual heat over immense geological epochs.”
