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Pulsars are dense, rapidly spinning remnants of massive stars that emit highly regular beams of radio waves.
Their extraordinarily fixed spinning rate makes them precise cosmic clocks.
Indian scientists are exploring novel methods to utilize these precise timings for measuring distances in deep space.
This research contributes to advanced astronomical techniques for understanding the universe's vastness.
Pulsars are highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation out of their magnetic poles. This radiation can only be observed when the emission beam points towards Earth, much like a lighthouse. The star's rotation causes the beam to sweep across the sky, producing regular pulses of radiation. These objects are incredibly dense, packing more mass than the Sun into a sphere only about 20 kilometers in diameter. Their formation occurs when massive stars (typically 8-20 times the mass of the Sun) exhaust their nuclear fuel, undergo a supernova explosion, and their core collapses under immense gravity.
Simple Analogy: Imagine a cosmic lighthouse. The 'light' (radio waves) from this lighthouse sweeps around as it spins. If you are on a ship (Earth) and the beam hits you, you see a flash. Because the lighthouse spins at a very steady rate, these flashes arrive at extremely regular intervals, making it a perfect cosmic clock.
Pulsars are a type of neutron star. Not all neutron stars are pulsars, but all pulsars are neutron stars. Neutron stars are also key in understanding extreme states of matter and gravitational wave sources.
Mergers of binary neutron star systems (which can include pulsars) are powerful sources of gravitational waves, detectable by observatories like LIGO and eLISA. Pulsar Timing Arrays (PTAs) also use the precise timing of pulsars to detect ultra-low frequency gravitational waves.
Pulsars, with their precise timing, can act as 'standard clocks' for astrometry and potentially contribute to the cosmic distance ladder, complementing methods like Cepheid variables and Type Ia supernovae for measuring vast cosmic distances.
The extreme precision of pulsar timing has been proposed for autonomous spacecraft navigation in deep space, acting as natural GPS beacons.
GS Paper III - Science & Technology; Prelims - General Science
General Awareness - Science & Technology
General Awareness - Science & Technology (less frequent, but possible factual questions)
General Science - Physics, Astronomy
General Science - Physics, Astronomy
What is the purpose of 'evolved Laser Interferometer Space Antenna (ELISA)' project?
Answer: To detect gravitational waves
Consider the following pairs: Objects in space : Description 1. Cepheids : Giant clouds of dust and gas in space 2. Nebulae : Stars which brighten and dim periodically 3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse How many of the above pairs are correctly matched?
Answer: Only one
"The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft." The experiment in question refers to
Answer: Evolved LISA
High, frequently tested in UPSC and other exams, especially in the context of space science and technology.
A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation.
A superdense stellar remnant formed after a supernova explosion of a massive star.
A powerful and luminous stellar explosion.
Ripples in spacetime caused by accelerating massive objects, such as merging neutron stars.
A proposed space-based observatory designed to detect gravitational waves.