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Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, ultraviolet, X-ray, infrared and radio waves that radiate from stars and other celestial objects. A stellar spectrum can reveal many properties of stars, such as their chemical ...
Its X-ray output is 2.3 × 10 31 W, about 60,000 times the total luminosity of the Sun. [11] Scorpius X-1 itself is a neutron star. This system is classified as a low-mass X-ray binary (LMXB); the neutron star is roughly 1.4 solar masses, while the donor star is only 0.42 solar masses. [12]
Social engineering (security) OPSEC. In the context of information security, social engineering is the psychological manipulation of people into performing actions or divulging confidential information. A type of confidence trick for the purpose of information gathering, fraud, or system access, it differs from a traditional "con" in the sense ...
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A charge card is one of the many forms of plastic you can carry in your wallet (or the virtual plastic you can keep in your digital wallet app). It looks, feels, smells and tastes a lot like a ...
Comcast and Diamond Sports announced Monday that 15 regional sports networks will be available on Thursday after being blacked out for three months. The Bally Sports networks were no longer ...
Star chart. A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [1] They have been used for human navigation since time immemorial. [2]