UPSC Courses

DNA banner


  • 04 July, 2021

  • 15 Min Read

Everything about: Gravitational Waves

Everything about: Gravitational Waves

Gravitational Waves (GW):

  • When 2 black holes merge, it will radiate GW. GW are ‘ripples’ in the fabric of space-time caused by some of the most violent and energetic processes in the Universe.
  • They are extremely weak so are very difficult to detect.
  • Albert Einstein predicted the existence of gravitational waves in 1916 in his general theory of relativity.
  • These ripples travel at the speed of light without being scattered significantly.

Sources of Gravitational waves

  • Mergers of black holes or neutron stars, rapidly rotating neutron stars, supernova explosions and the remnants of the disturbance caused by the formation of the universe, the Big Bang itself, are the strongest sources.
  • There can be many other sources, but these are likely to be too weak to detect.

What is the news? New source of Gravitational waves

  • Scientists have for the first time detected gravitational waves produced by the collision of a neutron star and a black hole.
  • This finding confirms that there are neutron star-black hole systems and will help answer many questions about the cosmos, from star formation to the expansion rate of our universe.
  • The reverberations from the two celestial objects were picked up using a global network of gravitational wave detectors, the most sensitive scientific instruments ever built, according to the researchers from UK’s Strathclyde University.
  • The university is part of the international network of scientists, the LIGO Scientific Collaboration.
  • In future the team hopes to detect cases where the black hole tearing apart the neutron star is observed in both gravitational waves and light.


  • It is an instrument that uses interference patterns formed by waves (usually light, radio, or sound waves) to measure certain characteristics of the waves themselves or of materials that reflect, refract, or transmit the waves.
  • Interferometers can also be used to make precise measurements of distance.
  • Interference patterns are produced when two identical series of waves are brought together.

Laser Interferometer Gravitational Wave Observatory (LIGO)

  • It is the world's largest gravitational wave observatory and a wonder of precision engineering.
  • It comprises of two enormous laser interferometers located thousands of kilometres apart, each having two arms which are 4 km long. The detectors are in (Livingston) Louisiana and (Hanford) Washington.
  • It exploits the physical properties of light and of space itself to detect and understand the origins of Gravitational Waves (GW). Upgraded version is called Advanced LIGO.
  • The Japanese detector, KAGRA, or Kamioka Gravitational-wave Detector, is expected to join the international network soon.
  • LIGO detectors: Unlike optical or radio telescopes, it does not see electromagnetic radiation

IndIGO (India Initiative of GW Observations) in Hingoli district, Maharashtra.

  • The proposed LIGO-India project aims to move one Advanced LIGO detector from Hanford to India.
  • LIGO-India project is envisaged as an international collaboration between the LIGO Laboratory and 3 lead institutions in the IndIGO consortium: Institute of Plasma Research (IPR) Gandhinagar, Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune and Raja Ramanna Centre for Advanced Technology (RRCAT), Indore.

Significance of IndiGo Project

  • To locate the source of gravitational waves more accurately.
  • Identification of new sources.
  • The project will help Indian scientific community to be a major player in the emerging research frontier of GW astronomy.
  • The high-end engineering requirements of the project (such as the world's largest ultra-high vacuum facility) will provide unprecedented opportunities for Indian industries in collaboration with academic research institutions.
  • A cutting edge project in India can serve as a local focus to interest and inspire students and young scientists.

Source: TH


   48th G7 SUMMIT IN GERMANY  The summit was held in BAVARIAN ALPS Germany from June 26th to 28th 2022. PT POINTER G7 48TH Summit was held under the presidency of Germany at BAVARIAN ALPS. Member Countries: US, Canada, France, UK, Germany, Italy, and Japan. BAVARIAN ALPS: It is a collectiv


MISLEADING ADVERTISEMENTS AND ROLE OF ENDORSERS IN ADVERTISING  Although a monetary penalty is provided for any misleading advertisement, but there are grey areas that need to be addressed. INDIAN ADS THAT WERE FOUND TO BE MISLEADING Arihant Mattress- Corona-Resistant The Arihant mattress released an advertisement in a Gu

Lancet Study On Road Safety and India’s Road Safety

Lancet Study On Road Safety and India’s Road Safety Measures The Lancet study highlights the urgency of implementing a safe system approach that can effectively address road injury death by 2030 and the number of lives that can be saved through intervention in road safety risk factors. The report uses mortality data from the Global Burd


PARTNERS IN THE BLUE PACIFIC US, Australia, New Zealand, Japan, and the United Kingdom have launched the new initiative known as ‘Partners in the Blue Pacific’ for effective and efficient cooperation with the small island nation of the region. It aims to enhance cooperation in the area of the climate crisis, connectivity, transpor

PGII to counter China's Belt and Road Initiative

PGII to counter China's Belt and Road Initiative In the recent G7 summit in Germany, the ambitious Partnership for Global Infrastructure and Investment (PGII) was unveiled, with the aim of collective mobilization of $600 billion by 2027 for transparent investment in infrastructure projects in developing and middle-income countries.  


Search By Date

Newsletter Subscription
SMS Alerts