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Galaxies in the Early Universe Seen Rotating in the Same Direction
Astronomers using the James Webb Space Telescope (JWST) have completed a survey of galaxies that reveals their rotation directions with unprecedented clarity. Contrary to expectations that galaxy rotations would be randomly distributed, they discovered a surprising pattern, that most galaxies appear to rotate in a similar direction! One hypothesis suggests the universe itself might have an overall rotation, researchers believe a more plausible explanation though is that Earth's motion through space creates an observational bias, making galaxies rotating in certain directions more detectable than others.
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El X-59 de la NASA completa las pruebas electromagnéticas
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater) El avión de investigación F-15D de la NASA está posicionado junto al X-59 durante las pruebas de compatibilidad electromagnética en la Planta 42 de las Fuerzas Aéreas de EE.UU. en Palmdale, California. Los investigadores activaron el radar, el transpondedor de banda C y las radios del F-15D a diferentes distancias del X-59 para evaluar las posibles interferencias electromagnéticas con los sistemas críticos de vuelo de la aeronave, garantizando que el X-59 pueda operar de forma segura con otras aeronaves. Estas pruebas demostraron que la integración de la aeronave está madurando y superó un importante obstáculo que la acerca un paso más al primer vuelo.NASA/Carla Thomas
Read this story in English here.
El silencioso avión supersónico de investigación X-59 de la NASA ha superado las pruebas electromagnéticas, confirmando que sus sistemas funcionarán juntos de forma segura y sin interferencias a través de diferentes escenarios.
“Alcanzar esta fase demuestra que la integración de la aeronave está avanzando,” dijo Yohan Lin, jefe de aviónica del X-59 de la NASA. “Es emocionante ver el progreso, sabiendo que hemos superado un gran obstáculo que nos acerca al primer vuelo del X-59.”
Las interferencias electromagnéticas ocurren cuando una fuente de campo eléctrico o magnético afecta a las operaciones de una aeronave, pudiendo afectar la seguridad. Estas interferencias, ya sean de una fuente externa o de los propios equipos de la aeronave, pueden alterar las señales electrónicas que controlan los sistemas críticos – similar a los efectos que produce la estática en un radio de un aparato emisor cercano, como un teléfono.
Las pruebas, realizadas en las instalaciones del contratista Lockheed Martin Skunk Works en Palmdale, California, garantizaron que los sistemas de a bordo del X-59 – como radios, equipos de navegación y sensores – no interfirieran entre sí ni causaran problemas inesperados. Durante estas pruebas, los ingenieros activaron cada sistema de la aeronave uno a la vez mientras monitoreaba los otros sistemas para detectar posibles interferencias.
El avión supersónico silencioso de investigación X-59 de la NASA ha superado con éxito las pruebas de interferencia electromagnética (EMI, por su acrónimo ingles) en Lockheed Martin Skunk Works, en Palmdale (California). Durante las pruebas EMI, el equipo examinó cada uno de los sistemas electrónicos internos del X-59, asegurándose de que funcionaban entre sí sin interferencias. El X-59 está diseñado para volar más rápido que la velocidad del sonido, reduciendo el estruendo fuerte a un estampido sónico más silencioso.NASA/Carla Thomas
“Estas pruebas nos ayudaron a determinar si los sistemas del X-59 interfieren entre sí,” explicó Lin. “En esencia, activamos un sistema y monitorizamos el otro para detectar ruidos, fallos o errores.”
El X-59 generará un estampido más silencioso en lugar de un estruendo fuerte mientras vuela más rápido que la velocidad del sonido. La aeronave es la pieza central de la misión Quesst de la NASA, que proporcionará a los reguladores información que podría ayudar a levantar las prohibiciones actuales de los vuelos supersónicos comerciales sobre tierra. Actualmente, la aeronave está siendo sometida a pruebas en tierra para garantizar su seguridad y rendimiento. Recientemente se han completado con éxito una serie de pruebas de motor. Las pruebas de interferencias electromagnéticas para examinar los sistemas electrónicos internos del X-59 siguieron.
En otras pruebas de interferencias electromagnéticas, el equipo examinó el funcionamiento del tren de aterrizaje del X-59, asegurándose de que este componente crítico puede extenderse y retraerse sin afectar a otros sistemas. También probaron que el cierre de interruptor de combustible funcionara correctamente sin interferencias.
Durante estas pruebas también se evaluó la compatibilidad electromagnética, para garantizar que los sistemas del X-59 funcionen correctamente cuando eventualmente vuele cerca de aviones de investigación de la NASA.
El piloto de pruebas de la NASA Jim Less se prepara para salir de la cabina del silencioso avión supersónico X-59 entre las pruebas de interferencia electromagnética (EMI). Las pruebas EMI garantizan el correcto funcionamiento de los sistemas del avión en diversas condiciones de radiación electromagnética. El X-59 es la pieza central de la misión Quesst de la NASA, diseñada para demostrar la tecnología supersónica.NASA/Carla Thomas
Los investigadores colocaron el X-59 en el suelo frente al F-15D de la NASA, a una distancia de 47 pies y luego a 500 pies. La proximidad de las dos aeronaves reproducía las condiciones necesarias para que el F-15D utilice una sonda especial para recopilar mediciones sobre las ondas de choque que producirá el X-59.
“Queremos confirmar que hay compatibilidad entre los dos aviones, incluso a corta distancia,” dijo Lin.
Para las pruebas de compatibilidad electromagnética, el equipo encendió el motor del X-59 al mismo tiempo que encendía el radar del F-15D, el transpondedor de radar de banda C y los radios. Los datos del X-59 se transmitieron al Centro de Operaciones Móviles de la NASA, donde el personal de la sala de control y los ingenieros observaron si se producían anomalías.
“Lo primero que hay que hacer es descubrir cualquier posible interferencia electromagnética o problema de compatibilidad electromagnética en tierra,” explica Lin. “Esto reduce el riesgo y nos asegura que no nos enteremos de los problemas en el aire.”
Ahora que han concluido las pruebas electromagnéticas, el X-59 está listo para pasar a las pruebas de pájaro de hierro virtual (una estructura que se utiliza para probar los sistemas de una aeronave en un laboratorio, simulando un vuelo real), en las que se introducirán datos en el avión bajo condiciones normales y de fallo, y después a las pruebas de rodaje antes del vuelo.
Artículo Traducido por: Priscila Valdez
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NASA’s Record-Shattering, Theory-Breaking MMS Mission Turns 10
5 min read
NASA’s Record-Shattering, Theory-Breaking MMS Mission Turns 10Since its launch on March 12, 2015, NASA’s MMS, or Magnetospheric Multiscale, mission has been rewriting our understanding of a key physical process that is important across the universe, from black holes to the Sun to Earth’s protective magnetic field.
This process, called magnetic reconnection, occurs when magnetic field lines tangle and explosively realign, flinging away nearby particles. Around Earth, a single magnetic reconnection event can release as much energy in a couple of hours as the entire United States uses in a day.
Over the past 10 years, thousands of research papers with discoveries by MMS have enabled a wide range of technical and scientific advances, such as those about the conditions on the Sun that create space weather, which can impact technology and communications at Earth. It has also enabled insights for fusion energy technologies.
“The MMS mission has been a very important asset in NASA’s heliophysics fleet observatory,” said Guan Le, MMS mission lead at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “It has utterly changed how we understand magnetic reconnection.”
An infographic listing MMS’ accomplishments after 10 years in space. NASA’s Goddard Space Flight Center/Kristen Perrin
Studying magnetic reconnection is key to understanding where this energy goes and how it can affect us down on the ground.
“The MMS mission not only studies universal physical processes, but it also allows us to probe the mechanisms that connect big eruptions on the Sun to things we experience on Earth, such as auroras, geomagnetic storms, and even power outages in extreme cases,” said Kevin Genestreti, MMS science deputy principal investigator and lead scientist at Southwest Research Institute’s Space Sector in Durham, New Hampshire.
The Perfect LaboratoryUsing four identical spacecraft, MMS studies magnetic reconnection while traveling in a long, oval-shaped orbit around Earth — a perfect laboratory for closely studying magnetic reconnection.
“You can measure reconnection in a laboratory, but the scales are so very small there that you can’t make the detailed measurements needed to really understand reconnection,” said Jim Burch, principal investigator for MMS at the Southwest Research Institute in San Antonio, Texas.
Magnetic reconnection primarily happens in two locations around Earth, one located on the side facing the Sun, and another behind Earth farther away from the Sun. In their orbit, the four MMS spacecraft repeatedly pass through these key locations.
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Before MMS, scientists only had a limited understanding of magnetic reconnection. But by improving instrument measurement speeds tenfold, MMS has been able to dramatically reshape what we know about the process. To date, MMS data has led to over 1,500 published scientific articles.
“For example, it turned out that the basic theory of reconnection in turbulent regions was wrong because previous missions couldn’t make observations at the level MMS can,” Burch said. “We also found reconnection in a lot of places that weren’t predicted.”
Working out new and refined theories of magnetic reconnection was an integral part of the MMS mission from the outset.
“One of the truly groundbreaking findings from MMS is that the heart of reconnection has a well-ordered beat – even if everything around is turbulent,” said Michael Hesse, MMS theory and modeling lead at NASA’s Ames Research Center in California’s Silicon Valley. “This shows that precision measurement can decide between competing theories.”
Enabling Breakthroughs for Science and ScientistsThe mission’s successes have also been a boon to young scientists, who are closely involved with the mission at all levels.
“In addition to its scientific achievements, it has also helped almost 50 students get doctorate degrees and enabled early career scientists to grow into leadership positions,” Le said.
To foster young scientists, MMS provides early career research grants to team members. The MMS team also created “Leads In-Training” roles to bring early career scientists to the table for big mission decisions and provide them the experience they need to move into leadership positions. The program has been so successful it is now required for all NASA Heliophysics missions.
Breaking RecordsBeyond its scientific achievements, MMS also holds several records. Only months after launch, MMS received its first Guinness World Record for highest GPS fix at 44,000 miles above Earth. It would later shatter this record as it moved into a longer orbit, taking it 116,300 miles — halfway to the Moon — away from GPS transponders at Earth. GPS is designed to send signals down toward Earth, so using it in space, where signals are weak, is challenging. By using GPS at high altitudes, MMS has shown its potential for other applications.
“This GPS demonstration has been of great interest for the developers of the Artemis missions, which is testing GPS at lunar distances,” said Jim Clapsadle, MMS mission director at NASA Goddard.
The mission also holds the Guinness World Record for smallest satellite formation, with just 2.6 miles between spacecraft. Over the years, MMS’ four spacecraft have flown in lines and pyramid-shaped formations from 5 to 100 miles across to help scientists study magnetic reconnection on a range of scales. In that time, the spacecraft’s health has remained remarkably well.
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“The hardware has proved very reliable, even now, 10 years into flight,” said Trevor Williams, MMS flight dynamics lead at NASA Goddard.
After launch, Williams and the flight operations team came up with more fuel-efficient ways to maneuver the spacecraft and keep them at their designated separations. As a result, the mission still has about a fourth of the fuel it launched with. This economy leaves enough fuel to continue operating the mission for decades. That’s good news to mission scientists who are eager to continue studying magnetic reconnection with MMS.
“We have thousands of magnetic reconnection events on the day side, but far fewer on the nightside,” Burch said. “But over the next three years we’ll be in a prime location to finish investigating nightside reconnection.”
By Mara Johnson-Groh
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Media Contact: Sarah Frazier
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