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Seller:holidaytimes✉️(49,610)99.5%, Location:Phoenix, Arizona, Ships to: Worldwide, Item:142782109053PSD UNDERWEAR NASA SPACE SHUTTLE ASTRONAUT URBAN MENS BOXER BRIEFS . NEW & NEVER USED OFFICIALLY LICENSED Men's boxer brief made with 88% polyester and 12% spandex. Breathable athletic feel. Contoured sealed pouch. Flex fit flatlock seams. Tagless/seamless back. 7 inch inseam. Wide soft elastic waistband. IN STOCK AND READY TO SHIP!!!!!! Normal 0 false false false MicrosoftInternetExplorer4 WILL COMBINE SHIPPING ON MULTIPLE ITEMS *** . IF YOU WIN MULTIPLE ITEMS AND ARE PAYING WITH PAYPAL, SEND ONE PAYMENT. *********HIGH BIDDER MUST SEND PAYMENT WITHIN 7 DAYS OF AUCTION CLOSE. Froo www.froo.com | Froo Cross Sell, Free Cross Sell, Cross promote, eBay Marketing, eBay listing Apps, eBay Apps, eBay ApplicationCondition:New with tags, All returns accepted:Returns Accepted, Refund will be given as:Money Back, Item must be returned within:30 Days, Return shipping will be paid by:Buyer, Restocking Fee:20%, Style:Boxer Brief, Brand:PSD UNDERWEAR, Size Type:Regular
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49,610+ items sold. 0.5% negative feedback. Great seller with very good positive feedback and over 50 ratings.
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Welcome to the PDS
NASAâs Planetary Science Division is seeking a highly experienced planetary science expert to serve as its Chief Scientist to represent the Planetary Data Ecosystem (PDE). The Planetary Data Ecosystem defines the broad community of planetary scientists, engineers, mission specialists, data providers, data users and planetary science educators who have interests in planetary missions and their data. The selected Chief Scientist will have a strong background in planetary science and serve as the liaison between the PDE and NASAâs Planetary Data System (PDS). The Chief Scientist will report to the PDS Program Scientist at NASA HQ.
The solicitation is open to the public. This virtual position will be served mostly remotely, will be part time and funded at approximately 0.2 FTE, depending on the details of funding arrangements. The position will be a temporary assignment, not to exceed three years, ending (at the latest) in fall 2024.
Candidates wishing to apply for this position should send their nomination package to Dr. Timothy P. McClanahan [email protected] The due date for applications is October 29, 2021 COB EST. Position details and nomination package requirements are described here.
The Planetary Data System (PDS) is a long-term archive of digital data products returned from NASA's planetary missions, and from other kinds of flight and ground-based data acquisitions, including laboratory experiments. But it is more than just a facility - the archive is actively managed by planetary scientists to help ensure its usefulness and usability by the world wide planetary science community.
Archive submissions are prepared by researchers under the guidance of PDS personnel. All products are peer-reviewed, well-documented, and easily accessible via a system of online catalogs that are organized by planetary disciplines.
Archived products are available on-line. When needed, PDS provides users access to staff to help with data selection. PDS also provides a variety of tools useful in producing, obtaining and using archived data. There is no cost associated with acquiring PDS archived data or tools or in getting reasonable amounts of PDS help. All PDS archived data may be exported outside of the United States under the U.S. Government's Technology and Software Publicly Available (TSPA) classification.
To learn more about PDS and the nodes, go to About the PDS.
Below are links to important information for the various categories of PDS users.
Data Users (Researchers, Educators, Students and the General Public)
Data Users include researchers, students, and educators who are interested in obtaining, manipulating, and understanding PDS data products. They intend to locate data products, find tools to work with those data products, and understand how those data products are formatted and structured.
Some information in this collection may also be of interest to the general public.
Data Proposers intend to submit a proposal for NASA funding, with the proposal including the intent to archive data in the PDS. The proposal might be prepared as part of a mission proposal, or as an individual researcher responding to a data analysis program call. A data proposer is looking for information on how to include PDS archiving in their proposal. A successful Data Proposer will later become a Data Provider.
Data Providers intend to submit data to PDS for peer review and subsequent archiving. They are looking for tools to develop their data products and archive bundles, and for documentation detailing PDS standards and bundle structure.
NASA proposes a magnetic shield to protect Mars' atmosphere
This week, NASA's Planetary Science Division (PSD) hosted a community workshop at their headquarters in Washington, DC. Known as the "Planetary Science Vision 2050 Workshop", this event ran from February 27th to March 1st, and saw scientists and researchers from all over the world descend on the capitol to attend panel discussions, presentations, and talks about the future of space exploration.
One of the more intriguing presentations took place on Wednesday, March 1st, where the exploration of Mars by human astronauts was discussed. In the course of the talk, which was titled "A Future Mars Environment for Science and Exploration", Director Jim Green discussed how deploying a magnetic shield could enhance Mars' atmosphere and facilitate crewed missions there in the future.
The current scientific consensus is that, like Earth, Mars once had a magnetic field that protected its atmosphere. Roughly 4.2 billion years ago, this planet's magnetic field suddenly disappeared, which caused Mars' atmosphere to slowly be lost to space. Over the course of the next 500 million years, Mars went from being a warmer, wetter environment to the cold, uninhabitable place we know today.
This theory has been confirmed in recent years by orbiters like the ESA's Mars Express and NASA's Mars Atmosphere and Volatile EvolutioN Mission (MAVEN), which have been studying the Martian atmosphere since 2004 and 2014, respectively. In addition to determining that solar wind was responsible for depleting Mars' atmosphere, these probes have also been measuring the rate at which it is still being lost today.
Without this atmosphere, Mars will continue to be a cold, dry place where life cannot flourish. In addition to that, future crewed mission – which NASA hopes to mount by the 2030s – will also have to deal with some severe hazards. Foremost among these will be exposure to radiation and the danger of asphyxiation, which will pose an even greater danger to colonists (should any attempts at colonization be made).
In answer to this challenge, Dr. Jim Green – the Director of NASA's Planetary Science Division – and a panel of researchers presented an ambitious idea. In essence, they suggested that by positioning a magnetic dipole shield at the Mars L1 Lagrange Point, an artificial magnetosphere could be formed that would encompass the entire planet, thus shielding it from solar wind and radiation.
Naturally, Green and his colleagues acknowledged that the idea might sounds a bit "fanciful". However, they were quick to emphasize how new research into miniature magnetospheres (for the sake of protecting crews and spacecraft) supports this concept:
"This new research is coming about due to the application of full plasma physics codes and laboratory experiments. In the future it is quite possible that an inflatable structure(s) can generate a magnetic dipole field at a level of perhaps 1 or 2 Tesla (or 10,000 to 20,000 Gauss) as an active shield against the solar wind."
In addition, the positioning of this magnetic shield would ensure that the two regions where most of Mars' atmosphere is lost would be shielded. In the course of the presentation, Green and the panel indicated that these the major escape channels are located, "over the northern polar cap involving higher energy ionospheric material, and 2) in the equatorial zone involving a seasonal low energy component with as much as 0.1 kg/s escape of oxygen ions."
To test this idea, the research team – which included scientists from Ames Research Center, the Goddard Space Flight Center, the University of Colorado, Princeton University, and the Rutherford Appleton Laboratory – conducted a series of simulations using their proposed artificial magnetosphere. These were run at the Coordinated Community Modeling Center (CCMC), which specializes in space weather research, to see what the net effect would be.
What they found was that a dipole field positioned at Mars L1 Lagrange Point would be able to counteract solar wind, such that Mars' atmosphere would achieve a new balance. At present, atmospheric loss on Mars is balanced to some degree by volcanic outpassing from Mars interior and crust. This contributes to a surface atmosphere that is about 6 mbar in air pressure (less than 1% that at sea level on Earth).
As a result, Mars atmosphere would naturally thicken over time, which lead to many new possibilities for human exploration and colonization. According to Green and his colleagues, these would include an average increase of about 4 °C (~7 °F), which would be enough to melt the carbon dioxide ice in the northern polar ice cap. This would trigger a greenhouse effect, warming the atmosphere further and causing the water ice in the polar caps to melt.
By their calculations, Green and his colleagues estimated that this could lead to 1/7th of Mars' oceans – the ones that covered it billions of years ago – to be restored. If this is beginning to sound a bit like a lecture on how to terraform Mars, it is probably because these same ideas have been raised by people who advocating that very thing. But in the meantime, these changes would facilitate human exploration between now and mid-century.
"A greatly enhanced Martian atmosphere, in both pressure and temperature, that would be enough to allow significant surface liquid water would also have a number of benefits for science and human exploration in the 2040s and beyond," said Green. "Much like Earth, an enhanced atmosphere would: allow larger landed mass of equipment to the surface, shield against most cosmic and solar particle radiation, extend the ability for oxygen extraction, and provide "open air" greenhouses to exist for plant production, just to name a few."
These conditions, said Green and his colleagues, would also allow for human explorers to study the planet in much greater detail. It would also help them to determine the habitability of the planet, since many of the signs that pointed towards it being habitable in the past (i.e. liquid water) would slowly seep back into the landscape. And if this could be achieved within the space of few decades, it would certainly help pave the way for colonization.
In the meantime, Green and his colleagues plan to review the results of these simulations so they can produce a more accurate assessment of how long these projected changes would take. It also might not hurt to conduct some cost-assessments of this magnetic shield. While it might seem like something out of science fiction, it doesn't hurt to crunch the numbers!
Source: Universe Today
Citation: NASA proposes a magnetic shield to protect Mars' atmosphere (2017, March 3) retrieved 18 October 2021 from https://phys.org/news/2017-03-nasa-magnetic-shield-mars-atmosphere.html
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