Gravitational Waves

Gravitational waves are ripples in the fabric of space-time that propagate outward from their source. They were first predicted by Albert Einstein in 1916 as part of his General Theory of Relativity. These waves are generated when massive astronomical objects, such as black holes or neutron stars, accelerate or orbit each other, similar to how ripples form on a pond’s surface when a stone is thrown in.

Understanding Waves and Gravitational Waves:

• Water waves are created when a stone is dropped into water.
• String waves are formed when a stretched string is shaken.
• Electromagnetic waves (like light, gamma rays, and radio waves) are emitted by astronomical objects and detected by instruments on Earth.
• Gravitational waves are a completely different type of wave, affecting the very structure of space and time itself.

• They are invisible but travel at the speed of light (186,000 miles per second or 3 × 10⁸ m/s).
• They squeeze and stretch anything in their path as they pass through space.
• They are extremely weak, making them difficult to detect.

Detection of Gravitational Waves:

Because gravitational waves are so faint, detecting them requires highly sensitive instruments. The LIGO (Laser Interferometer Gravitational-Wave Observatory) is one such observatory designed to detect these waves.

• In 2016, exactly 100 years after Einstein’s prediction, scientists detected gravitational waves for the first time from the collision of two black holes.
• Indian scientists have made significant contributions to this discovery.
• This breakthrough has opened a new way to study the universe, allowing scientists to observe astronomical events that were previously undetectable.