अंतरिक्ष विज्ञान – Page 7 – आवारा मुसाफिर

Camera captures night sky spiral after SpaceX rocket launch

January 29, 2023920 Views

A camera atop Hawaii’s tallest mountain has captured what looks like a spiral swirling through the night sky. Researchers believe it was from the launch of a military GPS satellite that lifted off earlier on a SpaceX rocket in Florida. The images were captured on Jan. 18 by a camera at the summit of Mauna Kea outside the National Astronomical Observatory of Japan’s Subaru telescope. A time-lapse video shows a white orb spreading out and forming a spiral as it moves across the sky. It then fades and disappears. Ichi Tanaka, a researcher at the Subaru telescope, said he was doing other work that night and didn’t immediately see it. Then a stargazer watching the camera’s livestream on YouTube sent him a screenshot of the spiral using an online messaging platform. “When I o...

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

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January 27, 20231021 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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Hubble finds hungry black hole twisting captured star into donut shape

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January 15, 2023844 Views

Black holes are gatherers, not hunters. They lie in wait until a hapless star wanders by. When the star gets close enough, the black hole's gravitational grasp violently rips it apart and sloppily devours its gasses while belching out intense radiation. Astronomers using NASA's Hubble Space Telescope have recorded a star's final moments in detail as it gets gobbled up by a black hole. These are termed "tidal disruption events." But the wording belies the complex, raw violence of a black hole encounter. There is a balance between the black hole's gravity pulling in star stuff, and radiation blowing material out. In other words, black holes are messy eaters. Astronomers are using Hubble to find out the details of what happens when a wayward star plunges into the gravitational abyss. ...

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Astronomers discover Milky Way galaxy’s most-distant stars

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January 12, 20231091 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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Serpent in the sky captured with ESO telescope

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January 6, 2023981 Views

A myriad of stars is revealed behind the faint orange glow of the Sh2-54 nebula in this new infrared image. Located in the constellation Serpens, this stunning stellar nursery has been captured in all its intricate detail using the Visible and Infrared Survey Telescope for Astronomy (VISTA) based at ESO’s Paranal Observatory in Chile. When the ancients looked up at the night sky they saw random patterns in the stars. The Greeks, for instance, named one of these “constellations” Serpens, because of its resemblance to a snake. What they wouldn’t have been able to see is that at the tail end of this constellation there is a wealth of stunning astronomical objects. These include the Eagle, the Omega and the Sh2-54 nebulae; the last of these is revealed, in a new light, in this spectacular ...

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Astronomers find that two exoplanets may be mostly water

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December 16, 2022644 Views

A team led by Université de Montréal astronomers has found evidence that two exoplanets orbiting a red dwarf star are “water worlds,” planets where water makes up a large fraction of the volume. These worlds, located in a planetary system 218 light-years away in the constellation Lyra, are unlike any planets found in our solar system. The team, led by PhD student Caroline Piaulet of the Trottier Institute for Research on Exoplanets (iREx) at the Université de Montréal, published a detailed study of a planetary system known as Kepler-138 in the journal Nature Astronomy. Piaulet, who is part of Björn Benneke's research team, observed exoplanets Kepler-138c and Kepler-138d with NASA's Hubble and the retired Spitzer space telescopes and discovered that the planets – which are about one ...

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NASA’s Orion capsule returns to Earth, capping Artemis I flight around moon

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December 12, 2022262 Views

NASA's Orion capsule barreled through Earth's atmosphere and splashed down in the Pacific ocean on Sunday after making an uncrewed voyage around the moon, winding up the inaugural mission of the U.S. agency's new Artemis lunar program 50 years to the day after Apollo's final moon landing. The gumdrop-shaped Orion capsule, carrying a simulated crew of three mannequins wired with sensors, plunked down in the ocean at 9:40 a.m. PST (1740 GMT) off Mexico's Baja California peninsula, demonstrating a high-stakes homecoming before NASA flies its first crew of Artemis astronauts around the moon in the next few years. U.S. Navy divers attach winch cables to NASA's Orion capsule after being successfully secured by a NASA and U.S. Navy team, off the coast of Baja California, Mexico, 11 Decembe...

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The messy death of a star

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December 10, 2022860 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, 2022673 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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Webb Space Telescope spots early galaxies hidden from Hubble

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November 19, 2022169 Views

NASA’s Webb Space Telescope is finding bright, early galaxies that until now were hidden from view, including one that may have formed a mere 350 million years after the cosmic-creating Big Bang. Astronomers said Thursday that if the results are verified, this newly discovered throng of stars would beat the most distant galaxy identified by the Hubble Space Telescope, a record-holder that formed 400 million years after the universe began. “Everything we see is new. Webb is showing us that there's a very rich universe beyond what we imagined,” said Tommaso Treu of the University of California at Los Angeles, principal investigator on one of the Webb programs. “Once again the universe has surprised us. These early galaxies are very unusual in many ways.” Launched last December as a...