अंतरिक्ष विज्ञान – Page 10 – आवारा मुसाफिर

The futuristic South Pole telescope looks far back in time

July 6, 2022273 Views

Surveying the cosmos from its isolated position in Antarctica, a collaborative project aims to reveal insights about the universe’s beginnings. In summer at the South Pole, which lasts from November through February, the average temperature is a biting minus 18 degrees F. The sun does not set during this time, making sleep a challenge. The environment is harsh and dry. And the Internet connection at the Amundsen–Scott South Pole Station, when you can access it, is painfully slow. On the other hand, distractions from work are few, and the landscape is stunning. The meals from the onsite kitchen are great. The best part? There’s an unparalleled view of the early universe. The South Pole Telescope is located at the Amundsen–Scott South Pole Station, Antarctica. The station features ...

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Meet the ‘zombie star’ that survived a supernova blast

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June 29, 2022168 Views

Astronomers have observed in a relatively nearby galaxy a star that not only survived what ordinarily should have been certain death - a stellar explosion called a supernova - but emerged from it brighter than before the blast. Meet the "zombie star." The star at issue, observed with the Hubble Space Telescope, is a kind known as a white dwarf, an incredibly dense object with about the mass of the sun crammed into the size of Earth. A white dwarf is the remaining core of a star that blew off a lot of its material at the end of its life cycle, as our sun is expected to do about 5 billion years from now. A 2005 image of the spiral galaxy NGC 1309, the location of a star explosion – a supernova - that did not result in stellar death. NASA, ESA, The Hubble Heritage Team (STSCI/AURA),...

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NASA: Give us back our moon dust and cockroaches

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June 25, 2022158 Views

NASA wants its moon dust and cockroaches back. The space agency has asked Boston-based RR Auction to halt the sale of moon dust collected during the 1969 Apollo 11 mission that had subsequently been fed to cockroaches during an experiment to determine if the lunar rock contained any sort of pathogen that posed a threat to terrestrial life. The material, a NASA lawyer said in a letter to the auctioneer, still belongs to the federal government. The material from the experiment, including a vial with about 40 milligrams of moon dust and three cockroach carcasses, was expected to sell for at least $400,000, but has been pulled from the auction block, RR said Thursday. This April 2022 handout photograph provided by RR Auction shows moon dust from the 1969 Apollo 11 mission, which w...

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In Tarantula Nebula, a stunning view of stars being born

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June 16, 2022329 Views

Astronomers have unveiled intricate details of the star-forming region 30 Doradus, also known as the Tarantula Nebula, using new observations from the Atacama Large Millimeter/submillimeter Array (ALMA). In a high-resolution image released by the European Southern Observatory (ESO) and including ALMA data, we see the nebula in a new light, with wispy gas clouds that provide insight into how massive stars shape this region. Astronomers have peered into a teeming stellar nursery in the Tarantula Nebula - a colossal cloud of gas and dust next door to our galaxy - gaining new understanding of the dynamics of star formation while obtaining a dazzling image of the cosmos. Researchers on Wednesday said their observations offered insight into the interplay between the irresistible force of ...

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Researchers create ‘Time Machine’ simulations to study lifecycle of ancestor Galaxy Cities

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June 12, 2022237 Views

For the first time, researchers have created simulations that directly recreate the full life cycle of some of the largest collections of galaxies observed in the distant universe 11 billion years ago, reports a new study in Nature Astronomy. Cosmological simulations are crucial to studying how the universe became the shape it is today, but many do not typically match what astronomers observe through telescopes. Most are designed to match the real universe only in a statistical sense. Constrained cosmological simulations, on the other hand, are designed to directly reproduce the structures we actually observe in the universe. However, most existing simulations of this kind have been applied to our local universe, meaning close to Earth, but never for observations of the distant univers...

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Astronomers ponder ‘cosmic mystery’ over powerful radio wave bursts

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June 8, 2022192 Views

Powerful bursts of radio waves emanating from a distant dwarf galaxy that were detected using a massive telescope in China are moving scientists closer to solving what one called a "cosmic mystery" that has lingered for years. Since being discovered in 2007, astronomers have struggled to understand what causes phenomena called fast radio bursts involving pulses of radio-frequency electromagnetic radiation originating from places inside our Milky Way and other galaxies. Radio waves have the longest wavelengths in the electromagnetic spectrum. An artist's conception of a neutron star with an ultra-strong magnetic field, called a magnetar, emitting radio waves (red). Magnetars are a leading candidate for what generates phenomena called fast radio bursts. Bill Saxton, NRAO/AUI/NSF/Hando...

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Astronomers reveal first image of the black hole at the heart of our galaxy

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May 12, 2022375 Views

Today, at simultaneous press conferences around the world, including at the European Southern Observatory (ESO) headquarters in Germany, astronomers have unveiled the first image of the supermassive black hole at the centre of our own Milky Way galaxy. This result provides overwhelming evidence that the object is indeed a black hole and yields valuable clues about the workings of such giants, which are thought to reside at the centre of most galaxies. The image was produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, using observations from a worldwide network of radio telescopes. The image is a long-anticipated look at the massive object that sits at the very centre of our galaxy. Scientists had previously seen stars orbiting around something invi...

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Black hole hunters cast gaze at center of the Milky Way galaxy

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May 10, 2022308 Views

Residing at the center of our spiral-shaped Milky Way galaxy is a beast - a supermassive black hole possessing 4 million times the mass of our sun and consuming any material including gas, dust and stars straying within its immense gravitational pull. Scientists have been using the Event Horizon Telescope (EHT), a global network of observatories working collectively to observe radio sources associated with black holes, to study this Milky Way denizen and have set an announcement for Thursday that signals they may finally have secured an image of it. The black hole is called Sagittarius A*, or SgrA*. First image of a black hole, captured by scientists using Event Horizon Telescope observations of the center of the galaxy M87. The image shows a bright ring formed as light bends in the...

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Virgin Galactic delays launch of commercial space flight service

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May 6, 2022627 Views

Virgin Galactic Holdings Inc will delay the launch of its commercial space flight service to the first quarter of 2023, the space tourism company said on Thursday, citing supply chain crisis and labor constraints. Due to this announcement, Virgin Galactic could be potentially left behind in emerging space tourism market. Shares of the company fell nearly 2% in extended trading. "We look forward to returning to space in the fourth quarter and launching commercial service in the first quarter of next year," Chief Executive Officer Michael Colglazier said. FILE PHOTO: Richard Branson stands on the floor of the New York Stock Exchange ahead of the start of trading in Virgin Galactic in New York, Oct. 28, 2019. REUTERS/Brendan McDermid The Richard Branson-founded company had earlie...

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Surprised astronomers find new type of star explosion – a micronova

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April 20, 2022683 Views

A team of astronomers, with the help of the European Southern Observatory’s Very Large Telescope (ESO’s VLT), have observed a new type of stellar explosion — a micronova. These outbursts happen on the surface of certain stars, and can each burn through around 3.5 billion Great Pyramids of Giza of stellar material in only a few hours. Astronomers have detected a previously unknown type of stellar explosion called a micronova involving thermonuclear blasts at the polar regions of a type of burned-out star called a white dwarf after it has siphoned material from a companion star. This artist’s impression shows a two-star system where micronovae may occur. The blue disc swirling around the bright white dwarf in the centre of the image is made up of material, mostly hydrogen, stolen from...