Science
Team successfully observes Australian eclipse in preparation for 2024 US eclipse
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Scientists from Southwest Research Institute (SwRI) led a team in the unique Citizen Continental-America Telescopic Eclipse (CATE) experiment to image the Sun’s outer atmosphere, the corona, during a short solar eclipse on the opposite side of the Earth. Using four platforms in the northwest corner of Australia, the team successfully observed the million-degree solar corona at the April 20 eclipse viewed from the Exmouth peninsula. The Australian eclipse serves both as a unique scientific opportunity and a training exercise for the program’s leadership in preparation for the 2024 U.S. eclipse.
The CATE 2024 team traveled nearly 10,000 miles for one minute of totality to observe the Sun’s corona from the unique perspective offered by total solar eclipses. These phenomena allow scientists to view the complex and dynamic outer atmosphere in ways that aren’t possible or practical by any other means, opening new windows into our understanding of the solar corona. SwRI is leading the Citizen CATE 2024 experiment, a broad scientific outreach initiative that will make a continuous 60-minute high-resolution movie during the April 8, 2024, solar eclipse over the United States. CATE 2024 will use a network of 35 teams of citizen scientists representing the local communities within the eclipse shadow path.
“Even though this was a very short eclipse, our team of community scientists performed flawlessly and captured fabulous images of the structure of the elusive solar corona,” said Dr. Amir Caspi, a principal scientist at SwRI in Boulder, Colorado, and leader of the CATE 2024 project.
The observations obtained by the team will allow scientists to study the complexities of the Sun’s corona including its complicated shape, how it changes over time, or what causes the corona to reach temperatures of millions of degrees Fahrenheit. Today’s images from Australia will also help the team to refine its experimental procedures for the immense, distributed community effort in the United States next year.
“This eclipse provided the perfect opportunity to test our equipment and procedures, and to train our community leaders for the next eclipse in 2024,” Caspi said. “When it comes to preparations for this kind of major effort, there’s no substitute for the real thing.”
The Citizen CATE 2024 project is led by SwRI, and includes the National Center for Atmospheric Research, the National Solar Observatory, the Laboratory for Atmospheric and Space Physics at the University of Colorado Boulder, and the Space Science Institute. Beyond its scientific goals, the project aims to engage many unique and diverse communities along the eclipse path as an integral part of a major scientific research effort.
“Total solar eclipses provide wonderful opportunities to bring together the public and science,” said Dr. Carrie Black, program officer for the National Solar Observatory at the NSF Astronomical Sciences Division. “The Citizen CATE 2024 project leverages the public value of science to create a lasting educational impact for both the scientific and local communities.”
“Citizen CATE is part of a growing family of NASA citizen science projects gearing up for the Heliophysics Big Year initiative in 2023-2024, inspiring joy and curiosity along with excellent participatory science opportunities,” said Dr. Elizabeth MacDonald, Citizen Science Strategic Working Group lead at NASA.
The current project builds on the experience of the first Citizen CATE experiment, which used 68 stations to observe the August 2017 total solar eclipse that crossed the entire continental United States. CATE 2024 expands the scientific objectives by measuring polarized light and engages with teams across the new eclipse path. Dr. Sarah Kovac, a 2017 CATE participant and now a postdoctoral researcher at SwRI, serves as project manager for CATE 2024.
“Participating in CATE as a young undergraduate inspired me to pursue a career in heliophysics,” said Kovac. “Seven years and one Ph.D. later, I get to be on the professional side of planning an eclipse expedition, and it’s beyond exciting to share this passion with the next generation of young scientists.”
The 2023 Australian observation effort includes team members from SwRI, NSO, NCAR, the University of Northern Colorado, Rice University, the University of Indiana, and the University of Maine.
The project will begin to recruit teams from eclipse path communities in Fall of 2023. Interested parties can find more information and a contact form on the project‘s website, https://eclipse.boulder.swri.edu.
For more information, visit https://www.swri.org/heliophysics.
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Team successfully observes Australian eclipse in preparation for 2024 US eclipse (2023, April 20)
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Science
An extra moon may be orbiting Earth — and scientists think they know exactly where it came from – Livescience.com
A fast-spinning asteroid that orbits in time with Earth may be a wayward chunk of the moon. Now, scientists think they know exactly which lunar crater it came from.
A new study, published April 19 in the journal Nature Astronomy, finds that the near-Earth asteroid 469219 Kamo’oalewa may have been flung into space when a mile-wide (1.6 kilometers) space rock hit the moon, creating the Giordano Bruno crater.
Kamo’oalewa’s light reflectance matches that of weathered lunar rock, and its size, age and spin all match up with the 13.6-mile-wide (22 km) crater, which sits on the far side of the moon, the study researchers reported.
China plans to launch a sample-return mission to the asteroid in 2025. Called Tianwen-2, the mission will return pieces of Kamo’oalewa about 2.5 years later, according to Live Science’s sister site Space.com.
“The possibility of a lunar-derived origin adds unexpected intrigue to the [Tianwen-2] mission and presents additional technical challenges for the sample return,” Bin Cheng, a planetary scientist at Tsinghua University and a co-author of the new study, told Science.
Related: How many moons does Earth have?
Kamo’oalewa was discovered in 2016 by researchers at Haleakala Observatory in Hawaii. It has a diameter of about 100 to 200 feet (approximately 30 to 60 meters, or about the size of a large Ferris wheel) and spins at a rapid clip of one rotation every 28 minutes. The asteroid orbits the sun in a similar path to Earth, sometimes approaching within 10 million miles (16 million km).
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Follow-up studies suggested that the light spectra reflected by Kamo’oalewa was very similar to the spectra reflected by samples brought back to Earth by lunar missions, as well as to meteorites known to come from the moon.
Cheng and his colleagues first calculated what size object and what speed of impact would be necessary to eject a fragment like Kamo’oalewa from the lunar surface, as well as what size crater would be left behind. They figured out that the asteroid could have resulted from a 45-degree impact at about 420,000 mph (18 kilometers per second) and would have left a 6-to-12-mile-wide (10 to 20 km) crater.
There are tens of thousands of craters that size on the moon, but most are ancient, the researchers wrote in their paper. Near-Earth asteroids usually last only about 10 million years, or at most up to 100 million years before they crash into the sun or a planet or get flung out of the solar system entirely. By looking at young craters, the team narrowed down the contenders to a few dozen options.
The researchers focused on Giordano Bruno, which matched the requirements for both size and age. They found that the impact that formed Giordano Bruno could have created as many as three still-extant Kamo’oalewa-like objects. This makes Giordano Bruno crater the most likely source of the asteroid, the researchers concluded.
“It’s like finding out which tree a fallen leaf on the ground came from in a vast forest,” Cheng wrote on X, formerly known as Twitter.
Confirmation will come after the Tianwen-2 mission brings a piece of Kamo’oalewa back to Earth. Scientists already have a sample of what is believed to be ejecta from Giordano Bruno crater in the Luna 24 sample, a bit of moon rock brought back to Earth in a 1976 NASA mission. By comparing the two, researchers could verify Kamo’oalewa’s origin.
Editor’s note: This article’s headline was updated on April 23 at 10 a.m. ET.
Science
"Hi, It's Me": NASA's Voyager 1 Phones Home From 15 Billion Miles Away – NDTV
<!–
Washington, United States:
NASA’s Voyager 1 probe — the most distant man-made object in the universe — is returning usable information to ground control following months of spouting gibberish, the US space agency announced Monday.
The spaceship stopped sending readable data back to Earth on November 14, 2023, even though controllers could tell it was still receiving their commands.
In March, teams working at NASA’s Jet Propulsion Laboratory discovered that a single malfunctioning chip was to blame, and devised a clever coding fix that worked within the tight memory constraints of its 46-year-old computer system.
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“Voyager 1 spacecraft is returning usable data about the health and status of its onboard engineering systems,” the agency said.
Hi, it’s me. – V1 https://t.co/jgGFBfxIOe
— NASA Voyager (@NASAVoyager) April 22, 2024
“The next step is to enable the spacecraft to begin returning science data again.”
Launched in 1977, Voyager 1 was mankind’s first spacecraft to enter the interstellar medium, in 2012, and is currently more than 15 billion miles from Earth. Messages sent from Earth take about 22.5 hours to reach the spacecraft.
Its twin, Voyager 2, also left the solar system in 2018.
Both Voyager spacecraft carry “Golden Records” — 12-inch, gold-plated copper disks intended to convey the story of our world to extraterrestrials.
These include a map of our solar system, a piece of uranium that serves as a radioactive clock allowing recipients to date the spaceship’s launch, and symbolic instructions that convey how to play the record.
The contents of the record, selected for NASA by a committee chaired by legendary astronomer Carl Sagan, include encoded images of life on Earth, as well as music and sounds that can be played using an included stylus.
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Their power banks are expected to be depleted sometime after 2025. They will then continue to wander the Milky Way, potentially for eternity, in silence.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Science
West Antarctica's ice sheet was smaller thousands of years ago – here's why this matters today – The Conversation
As the climate warms and Antarctica’s glaciers and ice sheets melt, the resulting rise in sea level has the potential to displace hundreds of millions of people around the world by the end of this century.
A key uncertainty in how much and how fast the seas will rise lies in whether currently “stable” parts of the West Antarctic Ice Sheet can become “unstable”.
One such region is West Antarctica’s Siple Coast, where rivers of ice flow off the continent and drain into the ocean.
This ice flow is slowed down by the Ross Ice Shelf, a floating mass of ice nearly the size of Spain, which holds back the land-based ice. Compared to other ice shelves in West Antarctica, the Ross Ice Shelf has little melting at its base because the ocean below it is very cold.
Although this region has been stable during the past few decades, recent research suggest this was not always the case. Radiocarbon dating of sediments from beneath the ice sheet tells us that it retreated hundreds of kilometres some 7,000 years ago, and then advanced again to its present position within the last 2,000 years.
Figuring out why this happened can help us better predict how the ice sheet will change in the future. In our new research, we test two main hypotheses.
Read more:
What an ocean hidden under Antarctic ice reveals about our planet’s future climate
Testing scenarios
Scientists have considered two possible explanations for this past ice sheet retreat and advance. The first is related to Earth’s crust below the ice sheet.
As an ice sheet shrinks, the change in ice mass causes the Earth’s crust to slowly uplift in response. At the same time, and counterintuitively, the sea level drops near the ice because of a weakening of the gravitational attraction between the ice sheet and the ocean water.
As the ice sheet thinned and retreated since the last ice age, crustal uplift and the fall in sea level in the region may have re-grounded floating ice, causing ice sheet advance.
The other hypothesis is that the ice sheet behaviour may be due to changes in the ocean. When the surface of the ocean freezes, forming sea ice, it expels salt into the water layers below. This cold briny water is heavier and mixes deep into the ocean, including under the Ross Ice Shelf. This blocks warm ocean currents from melting the ice.
Seafloor sediments and ice cores tell us that this deep mixing was weaker in the past when the ice sheet was retreating. This means that warm ocean currents may have flowed underneath the ice shelf and melted the ice. Mixing increased when the ice sheet was advancing.
We test these two ideas with computer model simulations of ice sheet flow and Earth’s crustal and sea surface responses to changes in the ice sheet with varying ocean temperature.
Because the rate of crustal uplift depends on the viscosity (stickiness) of the underlying mantle, we ran simulations within ranges estimated for West Antarctica. A stickier mantle means slower crustal uplift as the ice sheet thins.
The simulations that best matched geological records had a stickier mantle and a warmer ocean as the ice sheet retreated. In these simulations, the ice sheet retreats more quickly as the ocean warms.
When the ocean cools, the simulated ice sheet readvances to its present-day position. This means that changes in ocean temperature best explain the past ice sheet behaviour, but the rate of crustal uplift also affects how sensitive the ice sheet is to the ocean.
What this means for climate policy today
Much attention has been paid to recent studies that show glacial melting may be irreversible in some parts of West Antarctica, such as the Amundsen Sea embayment.
In the context of such studies, policy debates hinge on whether we should focus on adapting to rising seas rather than cutting greenhouse gas emissions. If the ice sheet is already melting, are we too late for mitigation?
Our study suggests it is premature to give up on mitigation.
Global climate models run under high-emissions scenarios show less sea ice formation and deep ocean mixing. This could lead to the same cold-to-warm ocean switch that caused extensive ice sheet retreat thousands of years ago.
For West Antarctica’s Siple Coast, it is better if we prevent this ocean warming from occurring in the first place, which is still possible if we choose a low-emissions future.
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