अंतरिक्ष विज्ञान – Page 6 – आवारा मुसाफिर

Dark Sky Protection: We are losing the universe

March 14, 2023687 Views

From city lights to satellite constellations, the heritage of the night sky is quickly slipping away Why is the dark night important, and what can we do to protect it? If you happen to live in a large city or major metropolitan area, you certainly have the opportunity to enjoy a vibrant nightlife. What you won’t be able to enjoy, however, is a vibrant night sky. Travel to a more rural area, however, and a summertime evening stroll would likely showcase hundreds of stars and clearly delineated constellations. Aside from those lucky enough to visit National Parks, that is about as good as it gets for most of the people in the United States; a pleasant view of the stars and brightest planets, but nothing that stops you in your tracks. And, believe it or not, the night sky can indeed st...

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Astronomers find missing link for water in the Solar System

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March 9, 2023932 Views

Using the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers have detected gaseous water in the planet-forming disc around the star V883 Orionis. This water carries a chemical signature that explains the journey of water from star-forming gas clouds to planets, and supports the idea that water on Earth is even older than our Sun. “We can now trace the origins of water in our Solar System to before the formation of the Sun,” says John J. Tobin, an astronomer at the National Radio Astronomy Observatory, USA and lead author of the study published today in Nature. This artist’s impression shows the planet-forming disc around the star V883 Orionis. In the outermost part of the disc water is frozen out as ice and therefore can’t be easily detected. An outburst of energy from...

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Astronomers astonished by ring around frigid distant world Quaoar

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February 9, 2023932 Views

The small distant world called Quaoar, named after a god of creation in Native American mythology, is producing some surprises for astronomers as it orbits beyond Pluto in the frigid outer reaches of our solar system. Researchers said on Wednesday they have detected a ring encircling Quaoar akin to the one around the planet Saturn. But the one around Quaoar defies the current understanding of where such rings can form - located much further away from it than current scientific understanding would allow. The distance of the ring from Quaoar places it in a location where scientists believe particles should readily come together around a celestial body to form a moon rather than remain as separate components in a disk of ring material. "This is the discovery of a ring located in a p...

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Jupiter’s moon count jumps to 92, most in solar system

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February 4, 20231035 Views

Astronomers have discovered 12 new moons around Jupiter, putting the total count at a record-breaking 92. That’s more than any other planet in our solar system. Saturn, the one-time leader, comes in a close second with 83 confirmed moons. The Jupiter moons were added recently to a list kept by the International Astronomical Union’s Minor Planet Center, said Scott Sheppard of the Carnegie Institution, who was part of the team. They were discovered using telescopes in Hawaii and Chile in 2021 and 2022, and their orbits were confirmed with follow-up observations. This photo made available by NASA shows the planet Jupiter, captured by the Hubble Space Telescope, on June 27, 2019. On Friday, Feb. 3, 2023, scientists said they have discovered 12 new moons around the gas giant, putti...

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Scientists release newly accurate map of all the matter in the universe

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February 2, 2023992 Views

Analysis combines Dark Energy Survey, South Pole Telescope data to better understand the evolution of universe Sometimes to know what the matter is, you have to find it first. When the universe began, matter was flung outward and gradually formed planets, stars and galaxies. By carefully assembling a map of that matter today, scientists can try to understand the forces that shaped the evolution of the universe. A group of scientists, including several with the U.S. Department of Energy’s Fermi National Accelerator Laboratory, have released one of the most precise measurements ever made of how matter is distributed across the universe today. Combining data from two major telescope surveys of the universe, the Dark Energy Survey and the South Pole Telescope, the analysis involve...

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Camera captures night sky spiral after SpaceX rocket launch

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January 29, 2023881 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, 2023978 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, 2023817 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, 20231058 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, 2023967 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 ...