Astronomers capture most distant star ever seen
Washington: American astronomers have captured the most distant normal star ever observed, some 9 billion light years from Earth, thanks to a rare cosmic alignment.
The study, published on Monday online in the journal Nature Astronomy, revealed the discovery of a star called Icarus, magnified by gravitational lensing by over 2,000 times, reported Xinhua.
Astronomers routinely study galaxies much farther away, visible because they glow with the brightness of billions of stars. They also managed to study supernova, often brighter than the galaxy in which it sits.
However, for a distance of about 100 million light years, the stars in these galaxies are impossible to make out individually.
But a phenomenon called gravitational lensing, the bending of light by massive galaxy clusters in the line of sight, can magnify the distant universe and make dim, far away objects visible.
The single star was discovered in NASA Hubble Space Telescope images taken in late April of 2016 and as recently as April 2017.
"You can see individual galaxies out there, but this star is at least 100 times farther away than the next individual star we can study, except for supernova explosions," said Patrick Kelly at the University of Minnesota, Twin Cities, the paper's first author.
These observations can provide a rare look at how stars evolve, especially the most luminous ones.
"For the first time ever we're seeing an individual normal star - not a supernova, not a gamma ray burst, but a single stable star - at a distance of nine billion light years," said Alex Filippenko, a professor of astronomy at UC Berkeley and one of many co-authors of the report.
The B-type star Icarus is much larger, more massive, hotter and possibly hundreds of thousands of times intrinsically brighter than our Sun.
According to the researchers, an extended lens, like a galaxy cluster, can only magnify a background object up to 50 times, but smaller objects can magnify much more.
A single star in a foreground lens, if precisely aligned with a background star, can magnify the background star thousands of times.
In this case, a star about the size of our sun briefly passed directly through the line of sight between the distant star Icarus and Hubble, boosting its brightness significantly.
Also, if the alignment was perfect, that single star within the cluster turned the light from the distant star into an "Einstein ring": a halo of light created when light from the distant star bends around all sides of the lensing star.
The ring is too small to discern from this distance, but the effect made the star easily visible by magnifying its apparent brightness.
The astronomers predict that Icarus will be magnified many times over the next decade as cluster stars move around, perhaps increasing its brightness as much as 10,000 times.
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Chinese astronauts return to earth safely after six-month stint in space station
Beijing, Nov 4: Three Chinese astronauts who spent six months developing China’s low orbit space station returned to Earth safely early Monday, the China Manned Space Agency (CMSA) said.
The capsule of the spaceship Shenzhou-18' carrying astronauts Ye Guangfu, Li Cong and Li Guangsu, touched down at the Dongfeng landing site in north China's Inner Mongolia Autonomous Region at 1:24 am (Beijing Time).
The three astronauts, after staying in orbit for 192 days, were all in good health and the Shenzhou-18 manned mission was a success, the CMSA said.
Ye, the Shenzhou-18 mission commander, has become the first Chinese astronaut with an accumulative spaceflight time of more than a year, setting a new record for the longest duration of stay in orbit by a Chinese astronaut.
He served as a crew member in the Shenzhou-13 mission from October 2021 to April 2022.
"Chinese astronauts have flown to space in successive missions. I believe that the record of the duration in orbit will be broken in the near future," Ye said.
Another astronaut Li Guangsu said that they grew two types of plants -- cherry tomatoes and lettuce -- and they had harvested some lettuce leaves for food.
"Being able to eat fresh vegetables in space is truly a blessing. These green plants have also brought a touch of green and good cheer to our busy work," Li was quoted by state-run Xinhua news agency.
China launched the Shenzhou-18 manned spaceship in April this year.
During the mission, the Shenzhou-18 crew utilised the scientific experiment cabinets and extravehicular payloads to carry out dozens of experiments in the fields of basic physics in microgravity, space material science, space life science, space medicine and space technology, Xinhua report said.
The three were relieved by another set of three Chinese astronauts, including a woman who docked with the orbiting space station on October 30.
China changes crew for the station every six months.
China built its space station after it was reportedly excluded from the International Space Station (ISS) over concerns that China's space programme is manned by its military, the People's Liberation Army, (PLA).
The two robotic arms of the station, especially the long one which has the ability to grab objects including satellites from space, drew international concerns.
Early this month China announced its plans for the further development of space programmes which included launching a manned lunar mission, construction of a lunar space station, exploration of habitable planets and extra-terrestrial life to expand its space programme in the next few decades.
