Distance in Space Measurement: New Pulsar Method by IIT Kanpur

Indian scientists from IIT-Kanpur, have developed a new method to measure distances in the universe by studying how radio signals from pulsars are distorted as they travel through space.

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Traditional Methods to Measure Distance in Space

• The traditional method uses time delay in radio signals (Dispersion Measure) caused by electrons to estimate distance.
• Limitation: It is less accurate in complex regions because it depends on uncertain models of electron distribution.

New Method to Measure Distance in Space

• Principle: The method studies how pulsar radio signals get distorted while travelling through space. 
• The scientists have applied both signal delay (dispersion) and signal spreading (scattering) of pulsar signals to measure distance more accurately.
• Data Used: The study analysed 10 pulsars in the Gum Nebula region to test the method.
  • The Gum Nebula is one of the largest ionised gas clouds (nebulae) in the Milky Way.
• Better Accuracy: Accounts for plasma disturbances, making results more reliable than older methods.
• Future Scope: The technique will be expanded to study hundreds of pulsars for better galactic mapping.

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What Are Pulsars? 

• Pulsars are the dense, rapidly spinning remnant cores of dead stars that emit beams of radio waves sweeping across Earth like a cosmic lighthouse.
• Formation: Pulsars are created when massive stars explode, leaving behind an extremely compressed core that continues to spin at incredible speeds.
• Lighthouse Effect: Pulsars emit beams of radio waves from their magnetic poles that sweep across space as they rotate, creating regular pulses when the beam points toward Earth.
• Cosmic Clocks: Pulsars have an extraordinarily fixed spinning rate, making their pulses arrive very regularly and predictably, earning them the nickname “nature’s most precise clocks.”

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