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Astronomers find a candidate second-generation planet around a white dwarf
ಸುದ್ದಿಯಲ್ಲಿ ಏಕೆ?
A planet born after its star died? The white dwarf concept GS3 Space questions test
A possible 'reborn' planet is reported around the white dwarf HS 0209+0832.
Why it matters: general awareness
What you need to know
2 ನಿಮಿಷ
Astronomers have identified a candidate for a second-generation planet orbiting the white dwarf HS 0209+0832, in findings published in Nature Astronomy on 5 October.
Such a planet would have formed from material left after the star's death, rather than surviving from its earlier life.
A white dwarf is the remnant of a low or medium-mass star such as the Sun.
ಮೂಲಗಳು: Topper IAS editorial (PIB / The Hindu / Indian Express)
ಮುಖ್ಯ ಅಂಶಗಳು
Remember these
- Astronomers report a candidate second-generation planet around the white dwarf HS 0209+0832.
- The findings were published in Nature Astronomy on 5 October.
- A second-generation planet would form from material left after the star's death, not survive from the star's earlier life.
- A white dwarf is the remnant of a low or medium-mass star such as the Sun.
- The planet is only a candidate and awaits further confirmation.
ಪ್ರಿಲಿಮ್ಸ್ · ಮೇನ್ಸ್
How the exam will ask it
ಪ್ರಿಲಿಮ್ಸ್
- A white dwarf is the final remnant of a low or medium-mass star such as the Sun, after it sheds its outer layers.
- A second-generation planet forms from debris produced after the host star's death, unlike a first-generation planet that forms with the star.
- Very massive stars may end as neutron stars or black holes, not white dwarfs.
ಮೇನ್ಸ್
GS3 Science and Technology: Space. Issue: the discovery of a candidate planet forming after stellar death challenges ideas that planets only form with young stars. Provision/policy: it rests on stellar evolution and exoplanet detection methods, with results peer-reviewed in journals like Nature Astronomy. Implication and way forward: it widens the search for habitable worlds, and India can build on this through ISRO and national observatories and international collaboration.
Quick recall
Answer before you reveal
ಖಗೋಳಶಾಸ್ತ್ರಜ್ಞರು ಇತ್ತೀಚೆಗೆ ಎರಡನೇ ತಲೆಮಾರಿನ ಗ್ರಹದ ಸಂಭಾವ್ಯ ಅಭ್ಯರ್ಥಿಯನ್ನು ಪತ್ತೆಹಚ್ಚಿದ ಬಿಳಿ ಕುಬ್ಜ (ವೈಟ್ ಡ್ವಾರ್ಫ್), ಯಾವ ನಕ್ಷತ್ರದ ವಿಶಿಷ್ಟ ಅಂತಿಮ ಹಂತ?
- ಕಪ್ಪುರಂಧ್ರವಾಗಿ ಕುಸಿಯುವ ಅತಿ ಬೃಹತ್ ನಕ್ಷತ್ರ
- ಸ್ಫೋಟಗೊಂಡು ನ್ಯೂಟ್ರಾನ್ ನಕ್ಷತ್ರ ಉಳಿಸುವ ಬೃಹತ್ ನಕ್ಷತ್ರ
- ಹೈಡ್ರೋಜನ್ ಸಮ್ಮಿಲನ ಆರಂಭಿಸದ ಕಂದು ಕುಬ್ಜ
- ಸೂರ್ಯನಂತಹ ಕಡಿಮೆ ಅಥವಾ ಮಧ್ಯಮ ದ್ರವ್ಯರಾಶಿಯ ನಕ್ಷತ್ರ
ಉತ್ತರ ನೋಡಿ
ಉತ್ತರ: D — ಸರಿಯಾದ ಉತ್ತರ: ಸೂರ್ಯನಂತಹ ಕಡಿಮೆ ಅಥವಾ ಮಧ್ಯಮ ದ್ರವ್ಯರಾಶಿಯ ನಕ್ಷತ್ರ — ಸೂರ್ಯನಂತಹ ನಕ್ಷತ್ರಗಳು ತಮ್ಮ ಹೊರ ಪದರಗಳನ್ನು ಚೆಲ್ಲಿ ಬಿಳಿ ಕುಬ್ಜ ಕೋರ್ ಅನ್ನು ಉಳಿಸುತ್ತವೆ.
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