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In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower the color index, the more blue (or hotter) the object is. Conversely, the larger the color index, the more red (or cooler) the object is.
The basic idea underlying gyrochronology is that the rotation period P, of a cool main-sequence star is a deterministic function of its age t and its mass M (or a suitable substitute such as color). Although main sequence stars of a given mass form with a range of rotation periods, their periods increase rapidly and converge to a well defined ...
HD 48948 is a K-type main-sequence star located in the constellation Lynx, approximately 55 light years away, based on a parallax of 59.393 mas.At an apparent magnitude of 8.58, it is too faint to be seen with the naked eye.
Effective temperature of a black body compared with the B−V and U−B color index of main sequence and supergiant stars in what is called a color-color diagram. [1] Stars emit less ultraviolet radiation than a black body with the same B−V index. Although stars are not perfect blackbodies, to first order the spectra of light emitted by stars ...
The last time to catch the International Space Station over Columbus this week is Wednesday. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
To catch the meteors, NASA suggests heading outside around midnight (in any time zone) and choose a spot far from light pollution.
Timelapse footage captured by German astronaut Alexander Gerst on the International Space Station shows the Russian spacecraft Soyuz MS-11 soaring out of Earth’s atmosphere on December 3.The ...
Stars with less than 0.23 M ☉ [58] are predicted to directly become white dwarfs when energy generation by nuclear fusion of hydrogen at their core comes to a halt, but stars in this mass range have main-sequence lifetimes longer than the current age of the universe, so no stars are old enough for this to have occurred.