How big are the stars? Detailed answer

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How big are the stars? Detailed answer

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How big are the stars?

Due to the extreme remoteness of the stars, no telescope can see a star as a ball of noticeable size. However, the diameter of a star can be roughly estimated based on the relationship between its size, luminosity, and surface temperature.

According to such estimates, the diameter of Aldebaran (alpha Taurus) is 36 times, the diameter of Arcturus (alpha Bootes) is 22 times, and the diameter of Capella (alpha Aurigae) is 16 times the diameter of the Sun. But this is far from the size limit of the giants of the stellar world - the diameter of Betelgeuse (alpha Orion) is 300-400 times larger than the solar one, and the diameters of two identical components of the eclipsing binary star VV Cephei are 1200 times larger.

At the same time, one of the smallest white dwarfs, the star Wolf 457, has a diameter 300 times smaller than the sun, or almost three times smaller than the Earth's. The diameter of the blue star discovered by Leyten in the constellation Cetus (designation LP 768-500) is 10 times smaller than the earth's and is approximately equal to the diameter of the asteroid Ceres.

Thus, the largest star is about a million times larger in diameter than the smallest one. And if we take into account that neutron stars have diameters of the order of 10 kilometers, then the ratio increases to a billion times.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What practical application did figurines originally have on car radiators?

In early cars, the radiator cap was opened separately from the hood, and by its heating it was possible to judge the temperature of the coolant. The Boyce MotoMeter took out a patent and began installing thermometers on radiator caps that were visible to drivers. Car manufacturers saw them as an additional branding element - over time, the need for sensors disappeared, and stylized figures took root on the hoods of many models. Later, statistics were collected that the figurines increase the amount of damage to pedestrians in collisions. Some manufacturers, such as Rolls-Royce and Mercedes-Benz, have not abandoned their placement, but have provided mechanisms that fold or pull the figures inward on a sharp blow.

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Ultrasonic gesture control of gadgets 07.10.2014

Elliptic Labs is demonstrating an innovative ultrasound-based gesture control system for mobile devices in Japan at CEATEC 2014.

The system requires one or two small radiators and an array of two or four sensitive microphones - the specific configuration is determined by the size of the mobile device. The frequency of the emitted waves is 40 kHz plus/minus 8 kHz, which is indistinguishable to the human ear.

The Elliptic Labs system is similar in some ways to radar. It allows you to form a sensitive area with a field of view of 180 degrees; You can interact with a mobile device from a distance of up to half a meter.

The developers note that the use of ultrasound makes it possible to implement a "multilayer" interface for interacting with a smartphone or tablet. Depending on the distance between the hand and the gadget, one or another “layer” can be activated to manage, say, first a list of applications, then a separate program, and then a certain function inside it.

The Elliptic Labs system is able to recognize the movements of the fingers, palm, entire hand and body of the user. The registration accuracy is approximately 1 mm. To convert gestures into commands, special accompanying software is used.

The developers claim that when the technology is brought to the mass market, its implementation will add only $2 to $4 to the cost of end devices. It is expected that gadgets with support for ultrasonic gesture control will appear on the market in the first half of 2015.

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