Connect with us

Science

Unique meteorite hints at parent asteroid lurking in our solar system – SlashGear

Published

 on


Researchers have been conducting a study on a mysterious meteorite that exploded over Sudan in 2008. The meteor was estimated by NASA to weigh about nine tons and to be nearly 13-foot in diameter when it was spotted before impact. After the meteorite entered the atmosphere and impacted the planet’s surface, researchers went to the Sudanese desert to collect its remains for study. One of those fragments suggests that the meteor likely broke off from a massive asteroid approximately the size of the dwarf planet Ceres.

Ceres is the largest object in the asteroid belt. The meteorite is known as Almahata Sitta (AhS) and is made of a material known as carbonaceous chondrite. The image above is of a section of the meteorite in false color. The makeup of the space rock provides researchers clues about the parent asteroid that birthed a given meteor.

An asteroid’s makeup can tell scientists how an asteroid was formed. In this study, the team analyzed a 50 milligrams sample of AhS under a microscope and discovered that it had a unique mineral makeup. Minerals in the asteroid were discovered to have formed at intermediate temperatures and pressures, higher than what you’d expect to find in a typical asteroid but lower than what you would find inside of a planet.

One of the minerals was particularly puzzling and is known as amphibole and requires prolonged exposure to water to form. That particular mineral has only been discovered once in another meteorite. The high content of amphibole suggests that the fragment researchers are studying broke off from a parent asteroid that has never deposited meteorites on Earth before.

Many more fragile minerals are unable to survive the entry into Earth’s atmosphere. Researchers on the study also mentioned they expect the asteroid samples bought back from Ryugu by JAXA will reveal minerals that rarely turn up in meteorites on Earth.

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Most stable laser transmission: world record set by Australian and French researchers – World Record Academy

Published

 on


Perth, Western Australia, Australia–Scientists from the International Centre for Radio Astronomy Research
(ICRAR) and the University of Western Australia
(UWA) teamed up with researchers from the French National Centre for Space Studies
(CNES) and the French metrology lab Systèmes de Référence Temps-Espace
(SYRTE) at Paris Observatory; by combining the Aussies’ phase stabilization technology with advanced self-guiding optical terminals, it allowed laser signals to be sent from one point to another without interference from the atmosphere, thus setting the new world record for the Most stable Laser transmission of a laser signal through the atmosphere.

The team set the world record for the most stable laser transmission by combining the Aussies’ phase stabilization technology with advanced self-guiding optical terminals. Together, these technologies allowed laser signals to be sent from one point to another without interference from the atmosphere.

Lead author Benjamin Dix-Matthews, a Ph.D. student at ICRAR and UWA, said the technique effectively eliminates atmospheric turbulence. “We can correct for atmospheric turbulence in 3-D, that is, left-right, up-down and, critically, along the line of flight,” he said. “It’s as if the moving atmosphere has been removed and doesn’t exist. It allows us to send highly stable laser signals through the atmosphere while retaining the quality of the original signal.”

Photo 1: UWA’s rooftop observatory. Credit: ICRAR.

The result is the world’s most precise method for comparing the flow of time between two separate locations using a laser system transmitted through the atmosphere, The
Phys.org reports.

ICRAR-UWA senior researcher
Dr. Sascha Schediwy said the research has exciting applications. “If you have one of these optical terminals on the ground and another on a satellite in space, then you can start to explore fundamental physics,” he said. “Everything from testing Einstein’s theory of general relativity more precisely than ever before, to discovering if fundamental physical constants change over time.”

The technology’s precise measurements also have practical uses in earth science and geophysics. “For instance, this technology could improve satellite-based studies of how the water table changes over time, or to look for ore deposits underground,” Dr. Schediwy said.

There are further potential benefits for optical communications, an emerging field that uses light to carry information. Optical communications can securely transmit data between satellites and Earth with much higher data rates than current radio communications.

[embedded content]

[embedded content]

Related world records:

Let’s block ads! (Why?)



Source link

Continue Reading

Science

SpaceX Launches Rocket With 143 Satellites – The Most Ever Flown On A Single Mission – Forbes

Published

 on


Elon Musk’s company SpaceX has successfully launched the Transporter-1 mission, breaking the record for the most number of satellites ever flown on a single rocket.

Today, Sunday, January 24 at 10 A.M. Eastern Time, the company’s Falcon 9 lifted off from Cape Canaveral in Florida, with 143 commercial and government satellites on board.

The satellites were launched into a sun-synchronous orbit, one that stays in constant daylight, about 500 kilometers above Earth’s surface.

About eight minutes later, the bottom section of the rocket returned to Earth and landed in the Atlantic Ocean on a floating barge called Of Course I Still Love You – a norm now on SpaceX launches.

The launch was the first in SpaceX’s new “Rideshare Program”, designed to launch many satellites at a time and enable organizations to reach space at a lower cost.

SpaceX has launched rideshare missions before, notably its SSO-A mission in 2018 with 64 satellites on board, but this new program is intended to greatly expand the launch opportunities on offer.

It cost just $5,000 per kilogram to place a satellite on this rocket, or $1 million for 200 kilograms. The total mass of all the commercial satellites on board was about 2,700 kilograms, equating to almost $14 million.

The launch of 143 satellites broke the previous record for the most number of satellites on a launch, set by India in 2017 when it launched 104 on a single rocket.

The satellites on board included 48 satellites from Earth imaging company Planet Labs, a small NASA mission called V-R3x to test ways to track small spacecraft in Earth orbit, and 36 small communications satellites from Swarm Technologies.

Ten of SpaceX’s own satellites in its controversial Starlink internet mega constellation were included, which reached the milestone of 1,000 satellites launched last week.

The total mass of the satellites on board was about 5,000 kilograms.

However, the large number of satellites on board – while impressive – has caused some concern, specifically regarding space traffic management.

SpaceX did not release a detailed manifest of the satellites on board, meaning the purpose and nature of some of them was unclear at the time of launch.

“One of the problems is that we don’t even know for sure what all of the 143 satellites are,” astronomer and spaceflight expert Jonathan McDowell from the Harvard-Smithsonian Center for Astrophysics told SpaceNews.

With some of the satellites being as small as a shoe box, they will be hard to track in orbit, a necessity to avoid collisions with other satellites.

This single launch alone will increase the number of active satellites in orbit by about five percent, given there are only about 3,000 active satellites currently orbiting Earth.

Or, in other words, one out of every 20 active satellites now in orbit were launched on this Transporter-1 mission.

Nonetheless, the launch is a huge milestone for SpaceX, letting it offer a new type of service unmatched by any other launch provider.

At $5,000 per kilogram, the flight was far cheaper for the satellites on board than on a rival commercial rocket.

For example, the New Zealand-based launch company Rocket Lab offers space on its smaller Electron rocket at about $20,000 per kilogram.

However, while these smaller launchers can’t match SpaceX on price, they can offer a dedicated launch to a specific orbit with a short wait time.

SpaceX with its rideshare missions, on the other hand, can only launch multiple satellites into one orbit, posing some issues to then move the satellites elsewhere.

Still, the service has clearly proven popular, and a Transporter-2 mission is expected later this year.

Now many will be hoping, if these launches are to become more regular, that more can be done to safely manage the large amounts of satellites deployed in orbit.

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Watch SpaceX's first dedicated rideshare rocket launch live, carrying a record-breaking payload of satellites – Yahoo Canada Shine On

Published

 on


Eat This, Not That!

Sure Sign You’ve Already Had COVID, According to Dr. Fauci

The coronavirus has claimed the lives of more than 410,000 Americans, and that doesn’t even count those who caught the virus and never got better, still suffering from Long COVID. In fact, these “long haulers” may never get better, and remain a shell of their former selves, tortured by a series of never-ending and ever-changing symptoms that debilitate them, with no cure yet available. Dr. Anthony Fauci, the chief medical advisor to the President and the director of the National Institute of Allergy and Infectious Diseases, has witnessed Long COVID first hand and wants you to know: “This is a phenomenon that is really quite real and quite extensive.” Read on to hear about one sure sign you may have it—and to ensure your health and the health of others, don’t miss these Sure Signs You’ve Already Had Coronavirus. You Might Feel Like You Have Myalgic EncephalomyelitisDr. Fauci has said that the effects of Long COVID are new and need further research—but that it resembles an existing syndrome. “You don’t want to be scaring people and alarming them, but they really should know that we don’t know what the long-term consequences are, even when it looks like a routine infection,” Dr. Fauci told Medscape in July. “We better be careful. Even after you clear the virus, there are postviral symptoms. I know, because I follow on the phone a lot of people who call me up and talk about their course. And it’s extraordinary how many people have a postviral syndrome that’s very strikingly similar to myalgic encephalomyelitis/chronic fatigue syndrome. They just don’t get back to normal energy or normal feeling of good health.”The other symptoms he has listed include myalgia—which are body aches and pains—and headaches, among others.What is Myalgic Encephalomyelitis?A syndrome misunderstood by even some doctors, “ME/CFS is a multi-system disease that causes profound metabolic dysfunction and is accompanied by physical and cognitive limitations,” according to the experts at #MEAction. Hallmark symptoms include:Post-Exertional Malaise, which #MEAction defines as “a reduction in functioning and a severe worsening of symptoms after even minimal physical or cognitive exertion.”Unrefreshing SleepHeadaches of a New Type or SeverityCognitive Symptoms—some call this “brain fog,” which Dr. Fauci calls an “inability to concentrate”And More.”People experience symptoms on a spectrum from severe to mild, but 75 percent of people with the disease are unable to work and 25 percent are homebound or bedridden,” according to #MEAction. “Based on past viral outbreaks, we are expecting 10-12 percent of all people with Covid-19 will go on to develop ME/CFS.””Unfortunately, we are still far away from a cure,” Adriane Tillman, Editor of #MEAction, tells us. “The paramount problem is the abysmal lack of research funding allotted to ME/CFS by our government. The bottom line is that research funding for ME/CFS is absurdly deficient. If you add up all the funding that the NIH has allocated to ME/CFS research over the past two decades, it wouldn’t even reach the total amount that the NIH should be spending in one year on ME/CFS based on the disease burden (the number of people who are sick and the effect on the quality-of-life).”Dr. Fauci has alluded to more research being done “now” on Long COVID, but no specifics have been mentioned. “It’s essential for us to learn all we can about how SARS-CoV-2, which is the coronavirus that causes COVID-19, leads to such widespread symptoms,” wrote National Institutes of Health director Dr. Francis Collins last week. “It’s also essential that we develop ways to better treat or prevent these symptoms. The NIH held a workshop last month to summarize what is known and fill in key gaps in our knowledge about Long COVID syndrome, which is clinically known as post-acute sequelae of COVID-19 (PASC). In December, Congress authorized funding for continued research on PASC, including an appropriation of funds for NIH to support continued study of these prolonged health consequences.”ME/CFS-like symptoms are also being studied in Post-COVID care centers at hospitals like Mt. Sinai. But we’re still at the “tip of the iceberg,” according to one scientist. “We need to dig in and do the work that needs to be done to help relieve the suffering and stop this madness,” said Dr. Michael Saag, an infectious disease expert from the University of Alabama at Birmingham, at the NIH workshop, which also included Dr. Fauci.What to Do if You Feel You Have Myalgic EncephalomyelitisContact a medical professional if you feel you have Long COVID or ME/CFS. Note that they are likely to treat your symptoms but are still learning to understand both ME/CFS and Long COVID. Also, there is no one-size-fits-all treatment. “The pathway to recovery or diagnosis for COVID-19 long haulers will not be uniform,” reports #MEAction. “Some long haulers will recover, a subset will go on to develop chronic illnesses like ME/CFS or postural orthostatic tachycardia syndrome (POTS), and some will have long-term consequences due to organ damage alone. Some long haulers are reporting symptoms that resemble ME/CFS, including post-exertional malaise, as well as cognitive challenges and sleep issues.” For the full list of 98 symptoms that COVID long haulers say they have suffered (not all are ME/CFS), don’t miss these Sure Signs You’ve Already Had Coronavirus.

Let’s block ads! (Why?)



Source link

Continue Reading

Trending