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Interstellar reddening is a different phenomenon from redshift, which is the proportional frequency shifts of spectra without distortion. Reddening preferentially removes shorter wavelength photons from a radiated spectrum while leaving behind the longer wavelength photons, leaving the spectroscopic lines unchanged.
2I/Borisov comet, the second confirmed interstellar object, photographed in late-2019 beside a distant galaxy. An interstellar object is an astronomical object (such as an asteroid, a comet, or a rogue planet, but not a star or stellar remnant) in interstellar space that is not gravitationally bound to a star.
The distance of a star follows immediately from the knowledge of both absolute and apparent magnitude, provided that the interstellar reddening of the star is either negligible or well known.
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Rho Ophiuchi (ρ Ophiuchi) is a multiple star system in the constellation Ophiuchus.The central system has an apparent magnitude of 4.63. [2] Based on the central system's parallax of 9.03 mas, [1] it is located about 360 light-years (110 parsecs) away. [1]
NEW DELHI (Reuters) -OpenAI faces an uphill climb as it argues that Indian courts cannot hear lawsuits about its U.S.-based business in the country, where Telegram has failed with similar defences ...
Reddening and stellar populations must be accounted for when using this method. Nearly all stars in the Galactic field, including the Sun, were initially born in regions with embedded clusters that disintegrated. This means that properties of stars and planetary systems may have been affected by early clustered environments. [17]
Elon Musk speaks with his son X Æ A-12 on his shoulders while next to U.S. President Donald Trump (not pictured) in the Oval Office of the White House in Washington, D.C., U.S., February 11, 2025.