An alien star has been discovered in the Milky Way. Free Technical Library News

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Alien star discovered in the Milky Way

17.05.2019

Employees of the National Astronomical Observatory of Japan put forward a hypothesis according to which one of the stars of Ursa Major is alien and originated in another galaxy. According to researchers, it became part of the Milky Way after its collision with another galaxy.

An analysis of the spectra of the star J1124+4535 has shown that it is poor in metals such as magnesium, but exhibits unexpectedly high levels of the heavy element europium. This ratio of chemical elements is unique for the stars of the Milky Way. Nevertheless, for neighboring dwarf galaxies it is quite typical.

This discovery gave reason to believe that several billion years ago there was a collision of the Milky Way with another galaxy. As a result, the galaxy was completely absorbed, and the star J1124 + 4535 remained, perhaps the only reminder of the cataclysm.

The star was discovered back in 2015, but only now scientists have received information about its composition.

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Tooth spies on a person 26.09.2013

A team of researchers from the National Taiwan University has developed a sensor designed to be embedded in the tooth. The sensor, using an accelerometer, is able to accurately determine exactly what actions the jaw performs: it participates in chewing, coughing, talking, smoking, eating, etc.

The sensor is small enough to fit inside an artificial tooth or inside a natural tooth. So far, the sensor uses tiny wires to transmit data to a computer, but the developers promise that the next prototype with the same dimensions will be equipped with a Bluetooth wireless transceiver. So far, the tooth sensor transmits information over thin wires, but in the near future the developers promise to introduce a wireless version.

The sensor works very simply. First, the scientists calibrated the device and recorded the accelerometer readings for a variety of human actions. Subsequently, a sensor installed in the jaw captures the accelerometer data and determines with high accuracy what the person is doing at the moment.

What would such a device be useful for? First of all for medical diagnostics. Such sensors may be needed by dentists to make a more accurate diagnosis when it is necessary to know a person's habits, the frequency of teeth grinding, eating, etc. Also, such devices can help the work of psychologists and nutritionists who need to control the patient's stress level and diet.

To test the accuracy of the instrument, the research team enlisted the help of eight volunteers. Subjects had a sensor attached to their teeth and were asked to perform several different activities for about 30 seconds: cough, chew gum, and so on. The accuracy of determining the type of movement was 93,8%.

The developers continue to work on improving the sensor and expect to soon have a wireless device that can fit in a conventional dental crown. In the future, it is possible that the functionality of such sensors will expand, for example, medical analyzers or a microphone will be added to them.

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