이 글의 요지는?

White dwarfs (WDs) are the final evolutionary product of the vast majority of stars in the Universe. They are electron-degenerate structures characterized by no stable thermonuclear activity, and their evolution is generally described as a pure cooling process. Their cooling rate is adopted as cosmic chronometer to constrain the age of several Galactic populations, including the disk, globular and open clusters. By analysing high-resolution photometric data of two very similar Galactic globular clusters (M3 and M13), we find a clear-cut and unexpected overabundance of bright WDs in M13. Theoretical models suggest that, consistent with the horizontal branch morphology, this overabundance is due to a slowing down of the cooling process in ~70% of the WDs in M13, caused by stable thermonuclear burning in their residual hydrogen-rich envelope. The presented observational evidence of quiescent thermonuclear activity occurring in cooling WDs brings new attention on the use of the WD cooling rate as cosmic chronometer for low-metallicity environments.

1. 백색왜성은 차갑게 식어가는 죽은 별이다.

2. M13 은하의 중성자별은 M3 은하의 백색왜성보다 빠르게 식고 있다.

3. 백색왜성 내부에 수소가 핵융합을 일으킨다.

4. 백색왜성의 표면에 핵융합 현상이 일어날 수도 있다.

5. 백색왜성은 다른 별들의 나이를 추정할 때 쓰인다.

출처는 https://www.nature.com/articles/s41550-021-01445-6 

일부러 수능 영어에서 쓰는 방식으로 오답 선지를 내봤습니당