astronomy – Page 3 – आवारा मुसाफिर

Green comet zooming our way, last visited 50,000 years ago

January 27, 2023977 Views

A comet is streaking back our way after 50,000 years. The dirty snowball last visited during Neanderthal times, according to NASA. It will come within 26 million miles (42 million kilometers) of Earth Wednesday before speeding away again, unlikely to return for millions of years. So do look up, contrary to the title of the killer-comet movie “Don’t Look Up.” This photo provided by Dan Bartlett shows comet C/2022 E3 (ZTF) on Dec. 19, 2022. It last visited during Neanderthal times, according to NASA. It is expected to come within 26 million miles (42 million kilometers) of Earth on Feb. 1, 2023, before speeding away again, unlikely to return for millions of years. (Dan Bartlett via AP) Discovered less than a year ago, this harmless green comet already is visible in the northern ...

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Astronomers discover Milky Way galaxy’s most-distant stars

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January 12, 20231057 Views

Astronomers have detected in the stellar halo that represents the Milky Way's outer limits a group of stars more distant from Earth than any known within our own galaxy - almost halfway to a neighboring galaxy. The researchers said these 208 stars inhabit the most remote reaches of the Milky Way's halo, a spherical stellar cloud dominated by the mysterious invisible substance called dark matter that makes itself known only through its gravitational influence. The furthest of them is 1.08 million light years from Earth. A light year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km). An undated illustration shows the Milky Way galaxy's inner and outer halos. A halo is a spherical cloud of stars surrounding a galaxy. NASA, ESA, and A. Feild (STScI)/Handout v...

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The messy death of a star

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December 10, 2022811 Views

A global forensic team of astronomers led by Australia’s Macquarie University reconstructs using stunning James Webb Space Telescope images Around 2500 years ago, a star ejected most of its gas, forming the beautiful Southern Ring Nebula, NGC 3132, chosen as one of the first five image packages from the James Webb Space Telescope (JWST). A team of nearly 70 astronomers from 66 organisations across Europe, North, South and Central America, and Asia have used the JWST images to piece together the messy death of this star. “It was nearly three times the size of our Sun, but much younger, about 500 million years old. It created shrouds of gas that have expanded out from the ejection site, and left a remnant dense white dwarf star, with about half the mass of the Sun, but approximat...

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Distant black hole is caught in the act of annihilating a star

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December 1, 2022648 Views

Astronomers have detected an act of extreme violence more than halfway across the known universe as a black hole shreds a star that wandered too close to this celestial savage. But this was no ordinary instance of a ravenous black hole. It was one of only four examples - and the first since 2011 - of a black hole observed in the act of tearing apart a passing star in what is called a tidal disruption event and then launching luminous jets of high-energy particles in opposite directions into space, researchers said. And it was both the furthest and brightest such event on record. This undated artist’s impression illustrates how it might look when a star approaches too close to a black hole, where the star is squeezed by the intense gravitational pull of the black hole. Some of the st...

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It’s a planet: New evidence of Baby Planet in the making

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September 15, 2022178 Views

Astronomers agree that planets are born in protoplanetary disks — rings of dust and gas that surround young, newborn stars. While hundreds of these disks have been spotted throughout the universe, observations of actual planetary birth and formation have proved difficult within these environments. Now, astronomers at the Center for Astrophysics | Harvard & Smithsonian have developed a new way to detect these elusive newborn planets — and with it, “smoking gun” evidence of a small Neptune or Saturn-like planet lurking in a disk. The results are described today in The Astrophysical Journal Letters. “Directly detecting young planets is very challenging and has so far only been successful in one or two cases,” says Feng Long, a postdoctoral fellow at the Center for Astrophysics who ...

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Hawaii seeks end to strife over astronomy on sacred mountain

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August 21, 2022170 Views

For more than 50 years, telescopes and the needs of astronomers have dominated the summit of Mauna Kea, a mountain sacred to Native Hawaiians that’s also one of the finest places in the world to study the night sky. That’s now changing with a new state law saying Mauna Kea must be protected for future generations and that science must be balanced with culture and the environment. Native Hawaiian cultural experts will have voting seats on a new governing body, instead of merely advising the summit’s managers as they do now. FILE PHOTO: The sun sets behind telescopes on July 14, 2019, at the summit of the Big Island's Mauna Kea in Hawaii. (AP Photo/Caleb Jones, File) The shift comes after thousands of protesters camped on the mountain three years ago to block the construction of a ...

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In Tarantula Nebula, a stunning view of stars being born

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June 16, 2022340 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, 2022240 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, 2022198 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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Surprised astronomers find new type of star explosion – a micronova

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April 20, 2022716 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...