New Method of Distance Measurement Based on Pulsars
Context:
Recently, astronomers from IIT Kanpur and the National Centre for Radio Astrophysics (NCRA), Pune have developed a new scientific method through which distances in deep space can be measured more accurately using signals from pulsars (Pulsars).
Key Points:
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- In this new method, the behaviour of radio signals coming from pulsars is studied. When these signals pass through gas and plasma present in space, they undergo changes such as dispersion and scattering. By analysing these changes, the distance can be estimated.
- This method reflects India’s growing capability in space science and is considered an important advancement in the field of astrophysics. This technique is expected to improve the accuracy of studies related to the structure of the Milky Way galaxy.
- In this new method, the behaviour of radio signals coming from pulsars is studied. When these signals pass through gas and plasma present in space, they undergo changes such as dispersion and scattering. By analysing these changes, the distance can be estimated.
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About Pulsars:
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- Pulsars are extremely dense and rapidly rotating neutron stars, which emit signals in the form of radio waves at regular intervals. They are also called “cosmic lighthouses.”
- They were discovered in 1967 and have since become important tools in astronomy because their timing is extremely precise.
- Pulsars are extremely dense and rapidly rotating neutron stars, which emit signals in the form of radio waves at regular intervals. They are also called “cosmic lighthouses.”
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Working of Pulsars:
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- Pulsars emit radio waves from their poles
- When these waves reach Earth, they are observed as regular pulses
- Their rotation is extremely stable, due to which they act like a cosmic clock
- Pulsars emit radio waves from their poles
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Scientific Basis of the New Method:
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- Traditionally, distances in space were measured using the Dispersion Measure (DM) method, which studies the time delay of signals.
- The new method uses a combined approach of two effects:
- Dispersion (time delay of signals)
- Scattering (spreading of signals)
- Dispersion (time delay of signals)
- By combining both effects, distance measurement becomes more accurate as it also accounts for the influence of interstellar plasma.
- Traditionally, distances in space were measured using the Dispersion Measure (DM) method, which studies the time delay of signals.
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Importance of the Method:
Measuring distances in space has always been one of the biggest challenges in astronomy.
Traditional methods include:
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- Trigonometric Parallax (for nearby stars)
- Spectroscopic Methods
- Dispersion-based Radio Astronomy
- All these methods have limitations, especially for very large distances. Hence, the pulsar-based method provides an advanced alternative.
- Trigonometric Parallax (for nearby stars)
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Conclusion:
This new method will not only improve the accuracy of measuring cosmic distances but will also help in understanding the structure and evolution of the galaxy. This recent achievement places India in a strong position in global astrophysics research and shows that Indian scientists are continuously pushing the frontiers of space research.
