NASA celebrates new astronauts
HOUSTON – NASA on Friday celebrated its latest class of graduating astronauts at a public ceremony in Houston, honoring a diverse and gender-balanced group now qualified for spaceflight missions including America’s return to the moon and eventual journey to Mars.
After completing more than two years of basic training, the six women and seven men were chosen from a record-breaking 18,000 applicants and represent a wide variety of backgrounds and specialties, from pilots to scientists, engineers and doctors.
The group included two candidates from the Canadian Space Agency (CSA), which has participated in a joint training program with the United States since 1983.
“They are the best of the best: They are highly qualified and very diverse, and they represent all of America,” said NASA Administrator Jim Bridenstine.
The class included five people of color, including the first Iranian-American astronaut, Jasmin Moghbeli, who flew helicopter combat missions in Afghanistan and holds an engineering degree from MIT, and geologist Jessica Watkins, who joins only a handful of black women to complete the program.
The group, known as the “Turtles,” wore blue flight jumpsuits and took turns approaching the podium to receive their silver astronaut pins, as their fellow classmates paid tribute to their character in the first-ever public graduation ceremony.
The tradition of handing out pins dates back to the Mercury 7 astronauts who were selected in 1959, with participants receiving their gold pins once they complete their first spaceflights.
After being selected in 2017, the class completed training in spacewalking at NASA’s underwater Neutral Buoyancy Lab, robotics, the systems of the International Space Station and piloting the T-38 training jet, plus Russian language lessons.
They are the first to graduate since NASA announced the Artemis program to return to the moon by 2024, this time on its south pole, as the United States plans to place the next man and first woman on lunar soil and set up an orbital space station.
Part of the group’s training therefore included studying the building blocks of that program, which are still being developed: the Space Launch System rocket, the Orion crew capsule and the gateway space station.
But NASA has already said that the crew of the first return moon mission, Artemis 3, will be selected from previous graduates.
Astronauts play an active role in the development of spacecraft, and the current group will eventually join the ranks of the approximately 500 people in history who have ventured into space.
The 11 U.S. astronauts bring the total number of NASA’s corps up to 48.
Their diversity stands in contrast to the early years of space exploration, long dominated by white men (including all 12 people who have walked on the moon), until Sally Ride became the first American woman in space in 1983 and Guion Bluford the first black astronaut the same year.
It also includes Indian American Raja Chari, an air force colonel and aeronautical engineer; Frank Rubio, a medical doctor and Blackhawk pilot; and Jonny Kim, a decorated Navy SEAL and emergency physician, who holds both a doctorate in medicine from Harvard and a mathematics degree.
“When I heard about possibly being a NASA astronaut I thought that was a platform like no other where I could leave a huge impact on the next generation and also contribute to our nation’s space exploration,” Kim told AFP.
Watkins praised what she called NASA’s emphasis on diversity.
“I think cultural and social change can be slow, even when it’s trending in the right direction,” she said.
The CSA’s newest astronauts are Joshua Kutryk, a Royal Canadian Air Force lieutenant colonel, and Jennifer Sidey-Gibbons who holds a doctorate in engineering from the University of Cambridge where she was working as an assistant professor in combustion in the Department of Engineering.
Asked about the difficulties she faced in her career, Moghbeli said some had questioned her choices when she decided to join the military after graduating from MIT.
“In a post-September 11 world, did my parents think I was crazy? Yes, I’m pretty sure they did,” she said, but added that her family then gave her their full support.
“It’s because of that that I’m here today, and I think everyone feels similarly, but — that being said — there will always be people out there that doubt.
“When I was a sixth grader and said I was going to become an astronaut, do you think everyone was like, ‘Yep, she’s going to become an astronaut’? Probably not.”
Scientists discover mysterious cosmic threads in Milky Way – The Guardian
Astronomers have discovered hundreds of mysterious cosmic threads that point towards the supermassive black hole at the heart of the Milky Way, after a survey of the galaxy.
The strange filaments, each of which stretches five to 10 light years through space, resemble the dots and dashes of morse code on a vast scale. They spread out from the galactic centre 25,000 light years from Earth like fragmented spokes on an enormous wheel.
Farhad Yusef-Zadeh, an astronomer at Northwestern University in Evanston, Illinois, said he was “stunned” to discover the structures in data taken by the MeerKAT radio telescope in the Northern Cape of South Africa.
The observatory, the most sensitive radio telescope in the world, captured images of the threads during an unprecedented 200-hour survey of the galactic core. Yusef-Zadeh told the Guardian: “They all seem to trace back to the black hole. They are telling us something about the activity of the black hole itself.”
Four decades ago, Yusef-Zadeh found much larger, vertical filaments surrounding Sagittarius A*, the black hole at the centre of the Milky Way, in data gathered by another telescope called the Very Large Array in New Mexico. Those structures dangle perpendicular to the plane of the Milky Way disc and measure 150 light years from top to bottom.
What produced the more numerous vertical filaments is still unclear, but studies have found that they possess strong magnetic fields and emit radio waves as they accelerate particles in cosmic rays to the verge of light speed.
According to Yusef-Zadeh, researchers – himself included – have been so busy grappling with the nature of the giant vertical threads that the existence of the shorter, horizontal filaments which trace back to the centre of the Milky Way almost went unnoticed.
“The emphasis has been on understanding the vertical filaments. The horizontal structures somehow didn’t register,” Yusef-Zadeh said. “It was a surprise to suddenly find a new population of structures that seem to be pointing in the direction of the black hole. I was actually stunned when I saw these.”
“If it wasn’t for MeerKAT these wouldn’t have been detected,” he added. “We’ve never been able to dedicate that amount of time to the centre of the galaxy.
The shorter, horizontal threads that spread out from the centre of the Milky Way came into focus when the scientists removed the background and filtered noise from the MeerKAT images. Yusef-Zadeh believes the structures, described in the Astrophysical Journal Letters, formed through a different process to the larger, vertical filaments.
He suspects that an outburst of material from the black hole about 6m years ago slammed into surrounding stars and gas clouds, creating streaks of hot plasma that point back towards the black hole. The effect is akin to blowing blobs of paint across a canvas with a hairdryer.
“The outflow from the black hole interacts with the objects it meets and distorts their shape,” Yusef-Zadeh said. “It’s sufficient to blow everything in the same direction.”
By studying the cosmic threads, astronomers hope to understand more about the spin of the Milky Way’s central black hole and the accretion disc of infalling material that whirls around it.
“These are not going to be the last images of the centre of the galaxy,” said Yusef-Zadeh. “Our galaxy is rich in lots of structures that we can’t explain. There’s still a lot to be learned.”
James Webb Space Telescope finds water in super-hot exoplanet's atmosphere – Space.com
The James Webb Space Telescope has found traces of water vapor in the atmosphere of a super-hot gas giant exoplanet that orbits its star in less than one Earth day.
The exoplanet in question, WASP-18 b, is a gas giant 10 times more massive than the solar system‘s largest planet, Jupiter. The planet is quite extreme, as it orbits the sun-like star WASP-18, which is located some 400 light-years away from Earth, at an average distance of just 1.9 million miles (3.1 million kilometers). For comparison, the solar system’s innermost planet, Mercury, circles the sun at a distance of 39.4 million miles (63.4 million km).
Due to such close proximity to the parent star, the temperatures in WASP-18 b’s atmosphere are so high that most water molecules break apart, NASA said in a statement. The fact that Webb managed to resolve signatures of the residual water is a testament to the telescope’s observing powers.
Related: Exoplanets, dark matter and more: Big discoveries coming from James Webb Space Telescope, astronomers say
“The spectrum of the planet’s atmosphere clearly shows multiple small but precisely measured water features, present despite the extreme temperatures of almost 5,000 degrees Fahrenheit (2,700 degrees Celsius),” NASA wrote in the statement. “It’s so hot that it would tear most water molecules apart, so still seeing its presence speaks to Webb’s extraordinary sensitivity to detect remaining water.”
WASP-18 b, discovered in 2008, has been studied by other telescopes, including the Hubble Space Telescope, NASA’s X-ray space telescope Chandra, the exoplanet hunter TESS and the now-retired infrared Spitzer Space Telescope. None of these space telescopes, however, was sensitive enough to see the signatures of water in the planet’s atmosphere.
“Because the water features in this spectrum are so subtle, they were difficult to identify in previous observations,” Anjali Piette, a postdoctoral fellow at the Carnegie Institution for Science and one of the authors of the new research, said in the statement. “That made it really exciting to finally see water features with these JWST observations.”
In addition to being so massive, hot and close to its parent star, WASP-18 b is also tidally locked. That means one side of the planet constantly faces the star, just like the moon‘s near side always faces Earth. As a result of this tidal locking, considerable differences in temperature exist across the planet’s surface. The Webb measurements, for the first time, enabled scientists to map these differences in detail.
The measurements found that the most intensely illuminated parts of the planet can be up to 2,000 degrees F (1,100 degrees C) hotter than those in the twilight zone. The scientists didn’t expect such significant temperature differences and now think that there must be some not yet understood mechanism in action that prevents the distribution of heat around the planet’s globe.
“The brightness map of WASP-18 b shows a lack of east-west winds that is best matched by models with atmospheric drag,” co-author Ryan Challener, of the University of Michigan, said in the statement. “One possible explanation is that this planet has a strong magnetic field, which would be an exciting discovery!”
To create the temperature map, the researchers calculated the planet’s infrared glow by measuring the difference in the glow of the parent star during the time the planet transited in front of the star’s disk and then when it disappeared behind it.
“JWST is giving us the sensitivity to make much more detailed maps of hot giant planets like WASP-18 b than ever before,” Megan Mansfield, a Sagan Fellow at the University of Arizona and one of the authors of the paper describing the results. said in the statement. “This is the first time a planet has been mapped with JWST, and it’s really exciting to see that some of what our models predicted, such as a sharp drop in temperature away from the point on the planet directly facing the star, is actually seen in the data.”
The new study was published online Wednesday (May 31) in the journal Nature.
JWST Scans an Ultra-Hot Jupiter's Atmosphere – Universe Today
When astronomers discovered WASP-18b in 2009, they uncovered one of the most unusual planets ever found. It’s ten times as massive as Jupiter is, it’s tidally locked to its Sun-like star, and it completes an orbit in less than one Earth day, about 23 hours.
Now astronomers have pointed the JWST and its powerful NIRSS instrument at the ultra-Hot Jupiter and mapped its extraordinary atmosphere.
Ever since its discovery, astronomers have been keenly interested in WASP-18b. For one thing, it’s massive. At ten times more massive than Jupiter, the planet is nearing brown dwarf territory. It’s also extremely hot, with its dayside temperature exceeding 2750 C (4900 F.) Not only that, but it’s likely to spiral to its doom and collide with its star sometime in the next one million years.
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For these reasons and more, astronomers are practically obsessed with it. They’ve made extensive efforts to map the exoplanet’s atmosphere and uncover its details with the Hubble and the Spitzer. But those space telescopes, as powerful as they are, were unable to collect data detailed enough to reveal the atmosphere’s properties conclusively.
Now that the JWST is in full swing, it was inevitable that someone’s request to point it at WASP-18b would be granted. Who in the Astronomocracy would say no?
In new research, a team led by a Ph.D. student at the University of Montreal mapped WASP-19b’s atmosphere with the JWST. They used the NIRISS instrument, one of Canada’s contributions to the JWST. The paper is “A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b.” It’s published in Nature, and the lead author is Louis-Philippe Coulombe.
The researchers trained Webb’s NIRISS (Near-Infrared Imager and Slitless Spectrograph) on the planet during a secondary eclipse. This is when the planet passes behind its star and emerges on the other side. The instrument measures the light from the star and the planet, then during the eclipse, they deduct the star’s light, giving a measurement of the planet’s spectrum. The NIRISS’ power gave the researchers a detailed map of the planet’s atmosphere.
With the help of NIRISS, the researchers mapped the temperature gradients on the planet’s dayside. They found that the planet is much cooler near the terminator line: about 1,000 degrees cooler than the hottest point of the planet directly facing the star. That shows that winds are unable to spread heat efficiently to the planet’s nightside. What’s stopping that from happening?
“JWST is giving us the sensitivity to make much more detailed maps of hot giant planets like WASP-18 b than ever before. This is the first time a planet has been mapped with JWST, and it’s really exciting to see that some of what our models predicted, such as a sharp drop in temperature away from the point on the planet directly facing the star, is actually seen in the data!” said paper co-author Megan Mansfield, a Sagan Fellow at the University of Arizona.
The lack of winds moving the atmosphere around and regulating the temperature is surprising, and atmospheric drag has something to do with it.
“The brightness map of WASP-18 b shows a lack of east-west winds that is best matched by models with atmospheric drag,” said co-author Ryan Challener, a post-doctoral researcher at the University of Michigan. “One possible explanation is that this planet has a strong magnetic field, which would be an exciting discovery!”
In our Solar System, Jupiter has the strongest magnetic field. Scientists think that swirling conducting materials deep inside the planet, near its bizarre liquid, metallic hydrogen core generates the magnetic fields. The fields are so powerful that they protect the three Galilean moons from the solar wind. They also generate permanent aurorae and create powerful radiation belts around the giant planet.
But WASP-18 b is ten times more massive than Jupiter, and it’s reasonable to think its magnetic fields are even more dominant. If the planet’s magnetic field is responsible for the lack of east-west winds, it could be forcing the winds to move over the North Pole and down the South Pole.
The researchers were also able to measure the atmosphere’s temperature at different depths. Temperatures increased with altitude, sometimes by hundreds of degrees. They also found water vapour at different depths.
At 2,700 Celsius, the heat should tear most water molecules apart. The fact that the JWST was able to spot the remaining water speaks to its sensitivity.
“Because the water features in this spectrum are so subtle, they were difficult to identify in previous observations. That made it really exciting to finally see water features with these JWST observations,” said Anjali Piette, a postdoctoral fellow at the Carnegie Institution for Science and one of the authors of the new research.
But the JWST was able to reveal more about the star than just its temperature gradients and its water content. The researchers found that the atmosphere contains Vanadium Oxide, Titanium Oxide, and Hydride, a negative ion of hydrogen. Together, those chemicals could combine to give the atmosphere its opacity.
All these findings came from only six hours of observations with NIRISS. Six hours of JWST time is precious to astronomers, and that’s all the researchers needed. That’s not only because the JWST is so powerful and capable, but also because of WASP-18 b itself.
At only 400 light-years away, it’s relatively close in astronomical terms. Its proximity to its star also helped, and the planet is huddled right next to its star. Plus, WASP-18 b is huge. In fact, it’s one of the most massive planets accessible to atmospheric investigation.
The planet’s atmospheric properties also provide clues to its origins. Comparisons of metallicity and composition between planets and stars can help explain a planet’s history. WASP-18 b couldn’t have formed in its current location. It must have migrated there somehow. And while this work can’t answer that conclusively, it does tell us other things about the giant planet’s formation.
“By analyzing WASP-18 b’s spectrum, we not only learn about the various molecules that can be found in its atmosphere but also about the way it formed. We find from our observations that WASP-18 b’s composition is very similar to that of its star, meaning it most likely formed from the leftover gas that was present just after the star was born,” Coulombe said. “Those results are very valuable to get a clear picture of how strange planets like WASP-18 b, which have no counterpart in our Solar System, come to exist.”
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