Key Facts

Scientific parameters of the gravitational wave breakthrough:

• Signal Identification: Catalogued as GW250114, representing the highest signal-to-noise ratio astrophysical detection recorded by the LIGO collaboration.
• Progenitor Bodies: Merger of two intermediate stellar black holes weighing 34 solar masses ($M_{\odot}$) and 32 solar masses ($M_{\odot}$).
• Spacetime Distortion: The merger radiated the equivalent of several solar masses of pure gravitational energy across the cosmos in fractions of a second.
• Distance: Located at an estimated co-moving cosmic distance of 1.3 billion light-years.
• Laser Interferometry: Detected by measuring sub-atomic laser phase shifts smaller than one-ten-thousandth the diameter of a proton across 4-kilometer vacuum arms.

GK Context

• Gravitational waves were theoretically predicted by Albert Einstein in 1916 as ripples in the fabric of spacetime caused by accelerated mass distributions under his General Theory of Relativity.
• A century later, on 14 September 2015, the LIGO detectors made the first direct detection (GW150914), earning Rainer Weiss, Barry Barish, and Kip Thorne the 2017 Nobel Prize in Physics.
• Gravitational wave astronomy enables humanity to 'hear' the dark universe beyond electromagnetic light.

Static GK

• LIGO-India (IndIGO) is an advanced gravitational wave observatory being built in Hingoli district, Maharashtra, under an inter-institutional collaboration between the Department of Atomic Energy (DAE) and Department of Science and Technology (DST) with IUCAA Pune, RRCAT Indore, and IPR Gandhinagar.
• It will join LIGO Hanford, LIGO Livingston, Virgo (Italy), and KAGRA (Japan) to form a planetary baseline.

UPSC Mains Framework

GS Paper III (Science & Technology & Major Scientific Infrastructure): Discuss the fundamental principles of gravitational wave astronomy. How will the operationalization of LIGO-India enhance multi-messenger astronomy and global astronomical triangulation?