ARIES Astronomers Map Cosmic Dust Across the Milky Way

Astronomers from the Aryabhatta Research Institute of Observational Sciences (ARIES) have created one of the most detailed maps of cosmic dust in the Milky Way, using data from over 6,000 open star clusters. The study, led by Dr. Y.C. Joshi, provides fresh insights into how dust is distributed across the galaxy and could help pinpoint regions where new stars are most likely to form.

Discovery of the “Reddening Plane”
The research reveals that interstellar dust does not lie flat along the Milky Way’s central plane. Instead, it forms a thin, wavy sheet called the “reddening plane,” which shifts up and down in a wave-like pattern. Interestingly, the Sun itself is located about 50 light years above this dusty layer.

Varying Density Across the Galaxy
Scientists found that the density of the dust varies, being thickest near the galactic centre and thinner in other regions. The highest concentration of dust was detected at galactic longitude 41 degrees, while the lowest was observed near 221 degrees.

Tracing Dust Through Star Clusters
Most of the open clusters analysed lie close to the galactic disk—the thin plane where stars are actively born. Their light, dimmed and reddened by cosmic dust, allowed researchers to accurately track its distribution.

Building Blocks of Stars and Planets
Cosmic dust is made of tiny particles of minerals, carbon, and other matter. Found both in space and on Earth, it plays a crucial role in influencing starlight and serves as the raw material for the formation of planets and stars.