Using the Institut de Radioastronomie Millmétrique 30 m telescope, we presented observations of N2H+J = 1−0, CCS JN = 87–76 and 77–66 lines toward a large sample of ultracompact H II regions (UC H IIs). Among our 88 UC H IIs, 87 and 33…
Category: 2. Space
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The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS
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No Influence of Passing Stars on Paleoclimate Reconstructions Over the Past 56 Million Years
Passing stars (also called stellar flybys) have notable effects on the solar system’s long-term dynamical evolution, injection of Oort cloud comets into the solar system, properties of trans-Neptunian objects, and more. Based on a simplified…
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A Detailed Investigation of HD 209458 b HST and JWST Transmission Spectra with SANSAR
HD 209458 b is the first exoplanet on which an atmosphere was detected. Since then, its atmosphere has been investigated using multiple telescopes and instruments. However, many of its atmospheric constraints remain debatable. While Hubble Space…
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U.S. Air Force halts plan for rocket landing pads on remote Pacific atoll amid environmental backlash
WASHINGTON — The U.S. Air Force has shelved a proposal to build two rocket landing pads on Johnston Atoll, a remote island in the central Pacific Ocean, following environmental concerns over potential harm to local wildlife, the U.S….
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Galaxies Had a “Thick Phase” – JWST Just Revealed How They Slimmed Down
The James Webb Space Telescope has given astronomers a stunning new window into the history of galaxies like our own Milky Way. By analyzing 111 edge-on galaxies, researchers discovered that galaxies form in two main stages: an early, chaotic…
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Hidden Rings Around Baby Stars Reveal Earliest Clues of Planet Birth
Sharper views of 78 infant-star disks in the Ophiuchus cloud reveal crisp rings and spirals—gravitational fingerprints of emerging planets—just a few hundred thousand years after the stars ignite. By reprocessing ALMA’s archival data at…
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