Tag: milky
James Webb telescope captures a Milky Way-like galaxy a billion light-years away
Astronomers at the European Space Agency (ESA) used the James Webb Space Telescope to capture an image of a spiral galaxy that resembles our home, the Milky Way. The star system, LEDA 2046648, sits a billion light-years away from ours in the constellation Hercules; it contains thousands of galaxies, trillions of stars and countless planets.
The ESA released the picture on January 31 (highlighted this week by The NY Times). The space agency described it as a mere calibration image to “verify the telescope’s capabilities as it was prepared for science operations.” ESA astronomers snapped it on May 22, 2022, with the Webb telescope’s Near InfraRed Camera (NIRCam).
That ultra-powerful camera can detect longer infrared wavelengths produced by light from this far away. Redshifting describes the stretching of light’s wavelength as it moves away from us, increasing until it appears redder than expected. It occurs because of the universe’s expansion: Distant systems like LEDA 2046648 keep moving farther from Earth.
Most of the visible blobs surrounding LEDA 2046648 are also galaxies, although several stars can be discerned by their diffraction spike patterns. Some objects in the image could be as old as 300 million years after the Big Bang. Of course, an image of anything one billion light-years away means we’re viewing the galaxy’s light from a billion years ago. So astronomers are eager to study early galaxies like this one (and even older ones) to help clarify the types of stars that condensed out of the Big Bang — and how supermassive black holes ended up in most galaxies’ centers.
Scientists drop absolutely stunning new view of the Milky Way galaxy
It took two years — and 21,400 shots — to capture an astonishing view of your spiraled galactic home, the Milky Way.
On Jan. 18, astronomers released a “gargantuan” survey of the Milky Way as part of an ambitious project called the “Dark Energy Camera Plane Survey.” They captured this view using an instrument called the Dark Energy Camera at the Cerro Tololo Inter-American Observatory, perched at 7,200 feet of elevation in Chile. The camera is mounted to a large telescope that spans over 13 feet wide; ultimately it snapped images of a whopping 3.32 billion objects, most of which are stars.
“This is quite a technical feat. Imagine a group photo of over three billion people and every single individual is recognizable!” Debra Fischer, division director of Astronomical Sciences at National Science Foundation, said in a statement. “Astronomers will be poring over this detailed portrait of more than three billion stars in the Milky Way for decades to come. This is a fantastic example of what partnerships across federal agencies can achieve.”
There are likely over 100 billion stars in the Milky Way, so this panorama is a deeply detailed sample of the galaxy as seen from Earth’s Southern Hemisphere. Take a look:
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The first image below: This is the panorama containing some 3.32 billion objects. “Most of the stars and dust in the Milky Way are located in its disk — the bright band stretching across this image — in which the spiral arms lie,” explained National Science Foundation’s NOIRLab, which runs big telescopes across the U.S. and elsewhere.
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The bottom image: This is one part of the giant cosmic panorama above. “This image, which is brimming with stars and dark dust clouds, is a small extract — a mere pinprick — of the full Dark Energy Camera Plane Survey (DECaPS2) of the Milky Way,” a NOIRLab press release explains.
Credit: DECaPS2 / DOE / FNAL / DECam / CTIO / NOIRLab / NSF / AURA // Image processing: M. Zamani & D. de Martin (NSF’s NOIRLab)
Credit: DECaPS2 / DOE / FNAL / DECam / CTIO / NOIRLab / NSF / AURA Image processing: M. Zamani & D. de Martin (NSF’s NOIRLab)
And if you want more, there’s more. You can view the entire survey, with the ability to zoom in and out, at the Legacy Survey Viewer website.
Our galaxy contains a plethora of stars, but it also contains giant regions of dust and gas. To peer through these obfuscating regions of space, astronomers captured wavelengths of light invisible to the naked eye that are called near-infrared wavelengths. This type of light, which travels in longer waves than visible light, can sneak or pass through space dust, revealing what lies beyond (the powerful James Webb Space Telescope views infrared light, too).
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These new images capture an almost incalculable number of stars. Still, there’s a lot we can’t see out there, but we can imagine. Most stars have at least one planet, and many have diverse solar systems. That adds up to over a trillion exoplanets in our Milky Way galaxy alone.
Some of these planets might rain gems. Some could be ocean worlds. Others could be rocky, Earth-sized planets. There’s untold potential out there in our galaxy, a place teeming with brilliant stars.
This story has been updated with additional information about the Dark Energy Camera Plane Survey.