What are mysterious cosmic objects shining brighter than the sun?

They produce way more energy than the sun and appear to break a physical boundary called the Eddington limit - now scientist found a possible explanation.

Swift X-ray observations of galaxy NGC 5408 indicate its ultraluminous X-ray source undergoes periodic changes every 115.5 days. This cycle, astronomers suspect, is linked to the orbit of a donor star around a middleweight black hole, as shown in this artist's view.

Swift X-ray observations of galaxy NGC 5408 indicate its ultraluminous X-ray source undergoes periodic changes every 115.5 days. This cycle, astronomers suspect, is linked to the orbit of a donor star around a middleweight black hole, as shown in this artist's view.

(photo credit: NASA/PUBLIC DOMAIN/VIA WIKIMEDIA COMMONS)

ByJERUSALEM POST STAFF

APRIL 14, 2023 22:29

RECOMMENDED STORIES

Palestinian Hamas terrorists keep guard on the day Hamas handed over deceased hostages in Khan Younis in the southern Gaza Strip February 20, 2025.

Admitting defeat? Why Hamas officials say the terror group 'lost control' of Gaza

JULY 7, 2025

Members of Hamas with the backdrop of the Gaza Strip, amid reports that Hamas has lost control of much of its territory.

'Security situation has collapsed': Hamas has lost 80% of its control over Gaza Strip

JULY 7, 2025

Sheikh Wadee' al-Jaabari.

Reporter's Notebook: 'Post' meets with top Hebron sheikh who wants to pull out of PA

JULY 6, 2025

IDF Maj.-Gen. Aviad Dagan entering a fighter jet; illustrative.

IDF cyber chief, retired Iran strategy head piloted fighter jets striking Iran

JULY 6, 2025

Hot Opinion

The tragic case of IDF soldier's suicide shows we must do more for our fighters

ByJPOST EDITORIAL

Salem Alketbi

Iran at a crossroads: Intelligence breaches, internal paranoia shake the regime

BySALEM ALKETBI

Is an Iran nuclear deal still possible after the US-Israel strikes?

ByCHUCK FREILICH

Paying for the 'day after': Who will fund Gaza’s reconstruction?

ByNEVILLE TELLER