Pune researchers find spiral galaxy like Milky Way from early universe, Pg3

Key Highlights:

• Indian researchers discovered Alaknanda, a massive spiral galaxy, dating back to when the universe was 1.5 billion years old.
• Alaknanda, discovered using the James Webb Space Telescope (JWST), challenges existing models of early galaxy formation.
• The galaxy exhibits a well-defined spiral structure, with two spiral arms and a central bulge, spanning 30,000 light-years.
• The discovery suggests that sophisticated galactic structures formed earlier than previously thought.

Detailed Insights:

• The discovery of Alaknanda challenges the understanding that early galaxies were chaotic and clumpy.
• Alaknanda's structure resembles the Milky Way, despite being present when the universe was 10% of its current age.
• Researchers plan to study the kinematics of gas and stars in Alaknanda to understand the formation of its spiral arms.
• Further studies using JWST and the ALMA telescope in Chile will explore if galaxies like Alaknanda represent a different evolutionary pathway in the early universe.
• The James Webb Space Telescope (JWST), launched in December 2021, is redefining our understanding of the universe by spotting some of the oldest galaxies.

Scientific/Technical Concepts Involved:

• Spiral Galaxy: A type of galaxy characterized by a central bulge surrounded by spiral arms.
• Light-year: The distance that light travels in one year, a unit used to measure astronomical distances.
• Kinematics: The study of the motion of objects without considering the forces that cause the motion.
• Big Bang: The prevailing cosmological model for the universe, which suggests it has expanded from an initial state of high density and temperature.