A team of Polish astronomers has created the most accurate three-dimensional map of the Milky Way to date, revealing surprising distortions and irregularities along the galactic disk.
Building an accurate map of the Milky Way is not easy.
Our location deep inside the gigantic structure means we can’t observe our galaxy externally, forcing us to envision its form from within. Dense expanses of stars, gas, and dust complicate our view even further. Despite these limitations, we know that the Milky Way is a spiral galaxy measuring around 120,000 light-years across, and that we’re located around 27,000 light-years from the galactic core.
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team of scientists from the Astronomical Observatory at the University of Warsaw has compiled the most accurate 3D map of the Milky Way to date. Astronomer Dorota Skowron led the study, which was published today in Science.
Animation showing the twisted shape of our galaxy.
GIF: J. Skowron/OGLE/Astronomical Observatory, University of Warsaw/Gizmodo
Among several other new findings, the updated 3D map shows the S-shaped structure of our galaxy’s distorted stellar disk. The Milky Way is not flat like a pancake, and is instead “warped and twisted,” in the words of co-author Przemek Mroz, who described his team’s work in a related video. That our galaxy is warped was already known, but the new research further characterizes the surprising extent of these distortions. As the new research shows, this warp starts at ranges greater than 25,000 light-years from the galactic core, and it gets more severe with distance.
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The new research also showed that the thickness of the Milky Way is variable throughout. Our galaxy gets thicker with distance from the core. At our location, for example, the galactic disk is about 500 light-years thick, but at the outer edges it’s as much as 3,000 light-years thick.
Milky Way Cepheids on the Milky Way map.
Image: J. Skowron/Serge Brunier
To create the 3D map, Skowron and her colleagues charted the location of Cepheid variable stars. These young, pulsating supergiants are ideal for this research because their brightness changes in a very regular pattern. Ultimately, the location of Cepheid stars within the Milky Way can be more accurately pinned down than other kinds of stars, which is precisely what was needed for this mapping project.
A sample of over 2,400 Cepheids was used to create the new map, the majority of which were identified with the Optical Gravitational Lensing Experiment (OGLE) survey, which monitors the brightness of nearly 2 billion stars. In total, the researchers observed the galactic disk for six years, taking 206,726 images of the sky.
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If this work sounds familiar, it’s because research published earlier this year in Nature Astronomy employed a similar technique, in which scientists from the Chinese Academy of Sciences reached similar conclusions, using a different group of Cepheids for their map. One of the scientists behind the previous research, Xiaodian Chen from the National Astronomical Observatories at the Chinese Academy of Sciences, took issue with the fact that the authors of the new paper did not cite his team’s work. Nonetheless, he still liked the new science.
Amazon-owned home security company Ring is pursuing contracts with police departments that would grant it direct access to real-time emergency dispatch data, Gizmodo has learned.
The California-based company is seeking police departments’ permission to tap into the computer-aided dispatch (CAD) feeds used to automate and improve decisions made by emergency dispatch personnel and cut down on police response times. Ring has requested access to the data streams so it can curate “crime news” posts for its “neighborhood watch” app, Neighbors.
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An internal police email dated April 2019, obtained by Gizmodo last week via a records request, stated that more than 225 police departments have entered into partnerships with Ring. (The company has declined to confirm that, or provide the actual number.) Doing so grants the departments access to a Neighbors “law enforcement portal” through which police can request access to videos captured by Ring doorbell cameras.
Ring says it does not provide the personal information of its customers to the authorities without consent. To wit, the company has positioned itself as an intermediary through which police request access to citizen-captured surveillance footage. When police make a request, they don’t know who receives it, Ring says, until a user chooses to share their video. Users are also prompted with the option to review their footage before turning it over.
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Through its police partnerships, Ring has requested access to CAD, which includes information provided voluntarily by 911 callers, among other types of data automatically collected. CAD data is typically compromised of details such as names, phone numbers, addresses, medical conditions and potentially other types of personally identifiable information, including, in some instances, GPS coordinates.
In an email Thursday, Ring confirmed it does receive location information, including precise addresses from CAD data, which it does not publish to its app. It denied receiving other forms of personal information.
Ring CAD materials provided to police.
According to some internal documents, police CAD data is received by Ring’s “Neighbors News team” and is then reformatted before being posted on Neighbors in the form of an “alert” to users in the vicinity of the alleged incident.
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Earlier this year, when the Seattle Police Department sought access to CAD software, it triggered a requirement for a privacy impact report under a city ordinance concerning the acquisition of any “surveillance technologies.”
According to the definition adopted by the city, a technology has surveillance capability if it can be used “to collect, capture, transmit, or record data that could be used to surveil, regardless of whether the data is obscured, de-identified, or anonymized before or after collection and regardless of whether technology might be used to obscure or prevent the capturing of certain views or types of information.”
Some CAD systems, such as those marketed by Central Square Technologies (formerly known as TriTech), are used to locate cellular callers by sending text messages that force the return of a phone-location service tracking report. CAD systems also pull in data automatically from phone companies, including ALI information—Automatic Location Identification—which is displayed to dispatch personnel whenever a 911 call is placed. CAD uses these details, along with manually entered information provided by callers, to make fast, initial decisions about which police units and first responders should respond to which calls.
According to Ring’s materials, the direct address, or latitude and longitude, of 911 callers is among the information the Neighbors app requires police to provide, along with the time of the incident, and the category and description of the alleged crime.
Ring said that while it uses CAD data to generate its “News Alerts,” sensitive details, such as the direct address of an incident or the number of police units responding, are never included.
Oddly enough no mention is made of voice recordings. Considering Amazon is building a huge database of voices and people through Alexa, cross referencing the two should be trivial and allow Amazon to surveil the population more closely
