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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SC asks Centre to consider amending law on terminating pregnancy of rape survivors
New Delhi (PTI): The Supreme Court on Thursday took strong exception to a plea by AIIMS seeking to set aside its order allowing a 15-year-old girl to medically terminate her 30-week pregnancy, and asked the Centre to consider amending the law to permit rape survivors to terminate unwanted pregnancies even beyond 20 weeks.
The top court said when there is pregnancy due to rape, there should not be a time limit.
Law needs to be organic and in sync with evolving time, it stressed.
A bench of Chief Justice Surya Kant and Justice Joymalya Bagchi said this is a case of child rape and the survivor will have a lifelong scar and trauma if termination is not allowed.
The top court said if the mother does not have permanent disability then it should be carried out.
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It asked AIIMS to counsel parents of the survivor over the issue and said the decision has to be of the person concerned.
"There are children for adoption. In this country we have lot of sympathies...There are deserted, abandoned children on the streets and even mafias on it. We have to look at them. This is an unwanted pregnancy of a 15-year-old child.
"This is a curative petition. Unwanted pregnancy cannot be thrusted on a person. Imagine she is a child. She should be studying now. But we want to make her a mother. Imagine the pain, the humiliation the child has suffered in this," the bench said.
Additional Solicitor General Aishwarya Bhati, appearing for AIIMS, mentioned the curative plea, and said the termination of pregnancy is not possible.
"It will be a live baby with severe deformities. Minor mother will have lifelong health issues and cannot reproduce. Minor mother will have lifelong health issues. This child can be given for adoption. It has been 30 weeks now. It is a viable life now," she said.
The top court said the decision on termination has to choice of the survivor and her parents and AIIMS may help them take an informed decision.
On April 24, a bench of Justices B V Nagarathna and Ujjal Bhuyan had allowed the girl to medically terminate her pregnancy of 30 weeks.
