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New York, November 9, 2017 : An international team of astronomers has made a bizarre discovery – a star that refuses to stop shining despite exploding more than once over a period of 50 years.
The explosions of stars, known as supernovae, have been observed in the thousands and in all cases they marked the death of a star.
But a new study, published in the journal Nature, challenges known theories about the death of stars. Their observations included data from Keck Observatory on Maunakea in Hawaii.
“The spectra we obtained at Keck Observatory showed that this supernova looked like nothing we had ever seen before. This, after discovering nearly 5,000 supernovae in the last two decades,” said study co-author Peter Nugent from Lawrence Berkeley National Laboratory in the US.
“While the spectra bear a resemblance to normal hydrogen-rich core-collapse supernova explosions, they grew brighter and dimmer at least five times more slowly, stretching an event which normally lasts 100 days to over two years,” Nugent said.
The supernova, named iPTF14hls, was discovered in September 2014 by the Palomar Transient Factory. At the time, it looked like an ordinary supernova.
Several months later, astronomers at Las Cumbres Observatory in the US noticed the supernova was growing brighter again after it had faded.
When astronomers went back and looked at archival data, they were astonished to find evidence of an explosion in 1954 at the same location.
This star somehow survived that explosion and exploded again in 2014.
“This supernova breaks everything we thought we knew about how they work. It’s the biggest puzzle I’ve encountered in almost a decade of studying stellar explosions,” said lead author Iair Arcavi, a NASA Einstein postdoctoral fellow at LCO and the University of California Santa Barbara.
The study calculated that the star that exploded was at least 50 times more massive than the Sun and probably much larger.
Supernova iPTF14hls may have been the most massive stellar explosion ever seen. The size of this explosion could be the reason that conventional understanding of the death of stars failed to explain this event.
Astronomers continue to monitor the supernova, which remains bright three years after it was discovered. (IANS)
Diwali is arguably one of the most auspicious and celebrated holidays in South Asia. It is celebrated over the span of five days, where the third is considered most important and known as Diwali. During Diwali people come together to light, lamps, and diyas, savour sweet delicacies and pray to the lord. The day has various origin stories with the main them being the victory of good over evil. While the North celebrates the return of Lord Rama and Devi Sita to Ayodhya, the South rejoices in the victory of Lord Krishna and his consort Satyabhama over evil Narakasura.
Narakasura- The great mythical demon King
Naraka or Narakasur was the son of Bhudevi (Goddess Earth) and fathered either by the Varaha incarnation of Vishnu or Hiranyaksha. He grew to be a powerful demon king and became the legendary progenitor of all three dynasties of Pragjyotisha-Kamarupa, and the founding ruler of the legendary Bhauma dynasty of Pragjyotisha.
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Narakasura was created, grew up to be strong and powerful but he was not satisfied with it, so he decided that he would worship Lord Brahma. He performed severe penance and was driven by the power of his penance; Lord Brahma appeared before him. Narakasura knew his mother loved him dearly so he asked Lord Brahma to grant him a boon that he would only die by the hands of his mother, Bhumidevi. Lord Brahma smile and ultimately granted him the boon.
Narakasura burst out laughing as Lord Brahma vanished. He thought no mother would kill their child so Lord Brahma had made him immortal. Drunk and maddened by his own power Narakasura brought all the kingdoms under his control and targeted Swargalok (Heaven). Even Indra (King of Gods) and demi-gods had to retreat in front of Narakasura. He kidnapped and took 16,000 women from the palaces as prisoners. Troubled by Naraksura's deeds the gods rushed to Lord Vishnu for a solution.
Lord Krishna and Devi Satyabhama were born to kill Narakasura
Lord Vishnu was born as Lord Krishna and Narakasura's mother Bhumidevi took the avatar of Krishna's wife Satyabhama. As Satyabhama, Bhumidevi was unaware of the knowledge of Naraksura being her son. Aditi the mother of all gods approached Satyabhama crying for help with bloodied ears as Narakasura had torn off the glowing earrings from the ears of Aditi.
Satyabhama was furious on gaining the knowledge of Narakasura's atrocities she asked Krishna to fight the demon king while she fights alongside him. Krishna agreed and they attacked the great fortress of Narakasura, riding his mount Garuda with his wife Satyabhama.
The furious battle unleashed. Krishna defeated Narakasura's general Mura and came to be known as Murari (the killer of Mura). Narakasura used several divine weapons against Krishna, but Krishna slew all those weapons effortlessly. The demon hurled a shakti towards Krishna, which mildly hurt Krishna and he fell unconscious. Upon this sight Satyabhama was enraged, she furiously pulled out a weapon of her own and hurled it at Narakasura's chest. Anxious Satyabhama turned to her fallen Lord, Krishna got up with a smile and he was completely fine. He was only playing his part. It was Satyabhama who was an incarnation of Bhoomidevi, whose hands were destined to slay Narakasura.
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Lord Krishna and Goddess Satyabhama had put an end to the Narakasura's kingdom of evil. As Narakasura lay on his deathbed he realised that Satyabhama was no one but an avatar of his own mother. He requested a boon from his mother, for no one to mourn his death. Instead, he wished for people to celebrate it with light and colours. They freed the 16,000 women who later married Lord Krishna to restore them of their honour in society, retrieved Mother goddess's earrings. This day is celebrated as 'Naraka Chaturdashi' popularly known as Choti Diwali - the day before Diwali as the triumph of good over evil.
Keywords: Diwali festival, goddess Laxmi, demon king, Lord Krishna, Satyabhama, the festival of light, Naraksura, Narak Chaturdashi
For all the great inventions that we have at hand, it is amazing how we keep going back to the safety pin every single time to fix everything. Be it tears in our clothes, to fix our broken things, to clean our teeth and nails when toothpicks are unavailable, to accessorize our clothes, and of course, as an integral part of the Indian saree. Safety pins are a must-have in our homes. But how did they come about at all?
The safety pin was invented at a time when brooches existed. They were used by the Greeks and Romans quite extensively. A man named Walter Hunt picked up a piece of brass and coiled it into the safety pin we know today. He did it just to pay off his debt. He even sold the patent rights of this seemingly insignificant invention just so that his debtors would leave him alone.
Anyone wearing safety pins that were visible began to be associated with the rock movement in the 70s. Image credit: Wikimedia Commons
Later, he even invented the sewing needles and a couple of other important inventions but never kept any of the patent rights.
When the punk rock tradition took over in the seventies, safety pins became a fashion rage. They were used as piercings and to patch clothes together. Anyone wearing safety pins that were visible began to be associated with the rock movement. In some cultures, the safety pins have become symbols of good luck.
Keywords: Safety-pins, Punk Rock, Brass, Accessories, Walter Hunt
In South India, Deepavali marks the end of the monsoon and heralds the start of winter. The festival is usually observed in the weeks following heavy rain, and just before the first cold spell in the peninsula. The light and laughter that comes with the almost week-long celebration are certainly warm to the bones, but there is still a tradition that the South Indians follow to ease their transition from humidity to the cold.
Just before the main festival, the family bathes in sesame oil. This tradition is called 'yellu yennai snaana' in Kannada, or 'ennai kuliyal' in Tamil, which translates to 'sesame oil bath'. The eldest member of the family applies three drops of heated oil on each member's head. They must massage this oil into their hair and body. The oil is allowed to soak in for a while, anywhere between twenty minutes to an hour. After this, they must wash with warm water before sunrise.
Women applying oil to the heads of men Photo credit: Indians in Kuwait
In some parts of the peninsula, soap is not used to wash off the oil because it nullifies its effects. Some cultures who do not like the oil to remain in any way on their skin wash it off with shikakai and herbs, which is a paste that is traditionally used as a substitute for soap. Sometimes, the oil is heated with flowers and spices as well and is less sticky than in its pure form.
The purpose of this ritual is to cleanse the body, detoxify it, and produce heat in it. Sesame is a very heaty substance and tends to heat up the body. This heat, or 'usshna' in Kannada, prepares the body to face the sudden cold that comes to the peninsula immediately after Diwali. South India has no smooth transition weather-wise from monsoon to winter. There are a few days of stable, rainless weather, and suddenly the cold winds descend.
In many ways, the celebration of Diwali is centered around preparing for winter, considering the amount of heat and light the rituals consist of – lighting lamps, bursting crackers, and consuming warm treats. Those who practice these rituals earnestly find the shift in seasons and weather quite pleasant.
Keyboards: Sesame Oil Bath, Diwali Ritual, Traditional Sesame Oil Bath