First stars that formed after Big Bang identified
London, May 17: Japanese scientists have identified some of the first stars to form in the Universe just 250 million years after the Big Bang, according to a study published in Nature magazine.
Using the giant ALMA telescope in Chile, researchers were able to observe the distant galaxy MACS1149-JD1 when it was just 550 million years old, a time when it contained stars that were about 300 million years old, the study published on Wednesday said.
The galaxy's "red shift," a measurement technique that shows the distance to, and the age of astronomical objects, which was determined to be 9.1096, the largest value ever detected to date using spectral line analysis, Efe news reported.
The Japanese researchers arrived at that red shift measurement using the spectral lines of ionized oxygen insted of using ionized carbon, as is normally done in examining distant objects.
The results demonstrate the usefulness of ALMA as a tool for measuring the red shift of distant galaxies, Rychard Bouwens, an astrophysicist at Leiden University, said in another article in Nature.
The work of Takuya Hashimoto and his group at Osaka Sangyo University sheds light on the formation of the first stars and suggests that future telescopes - such as the James Webb Space Telescope, which will replace the Hubble 'scope in orbit starting in 2020 - could find new evidence on the formation of first-generation stars, Bouwens said.
Scientists believe that the Universe's first stars formed in regions of very dense matter, although understanding of that process is still limited.
Bouwens emphasised that it was still not clear whether the stellar activity detected in MACS1149-JD1 occurred in other regions in the early Universe, but he added that the discovery would spur similar studies of other galaxies.
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3 US troops killed, 5 seriously wounded during Iran attacks, military says
Washington (AP): Three American service members have been killed and five others seriously wounded during the US attacks on Iran, the military said Sunday, marking the first American casualties in a major offensive that has sparked retaliation from the Islamic Republic.
US Central Command, which oversees the Middle East, announced the deaths in a post on X but did not say when and where they occurred. The statement said “several others sustained minor shrapnel injuries and concussions” and were going to return to duty.
Central Command described the situation “as fluid” and said it would withhold the identities of the service members who were killed for 24 hours after their families were notified.
The US military also denied Iranian claims that the USS Abraham Lincoln aircraft carrier was struck with ballistic missiles, saying on X that the “missiles launched didn't even come close.”
President Donald Trump had warned that American troops could be killed or injured in the operation.
“The lives of courageous American heroes may be lost, and we may have casualties,” the Republican president said in a video address released early Saturday. “That often happens in war. But we're doing this not for now. We're doing this for the future.”
Following the US-Israeli strikes that killed Iran's supreme leader, Ayatollah Ali Khamenei, and other leaders, Iran's counterattacks have struck US bases in Bahrain and the United Arab Emirates.
Iran's paramilitary Revolutionary Guard has threatened to launch its “most intense offensive operation” ever targeting Israeli and American military installations.
Before the strikes, Trump had built up the largest US military presence in the Middle East in decades. The arrival of the Lincoln and three accompanying guided-missile destroyers at the end of January bolstered the number of warships in the region.
The world's largest aircraft carrier, the USS Gerald R. Ford, and four accompanying destroyers later were dispatched from the Caribbean Sea to head to the Middle East.
The Ford was part of the US raid in Venezuela that captured leader Nicolás Maduro, who was brought to New York to face drug trafficking charges. The operation in January claimed no American lives but left seven US troops with gunshot wounds and shrapnel-related injuries.
One of those injured received the Medal of Honor during Trump's State of the Union address last week. Trump said Army Chief Warrant Officer 5 Eric Slover piloted the lead CH-47 Chinook helicopter that descended on the “heavily protected military fortress” where Maduro was staying.
Trump has launched several military operations during his second term, including strikes on members of the Islamic State group in Syria in retaliation for an ambush attack that killed two US troops and an American civilian interpreter in December.
The US military has also struck IS forces in Nigeria, after Trump accused the West African country's government of failing to rein in the targeting of Christians.
