Previously, the Cepheid variables of other galaxies could not be used for distance measurement because they cover metallicity ranges that differ from those of the Milky Way. Refrain from using words such as a, and, for, the, etc. Using the Spitzer data, the researchers estimated that stars are forming in the central regions of NGC 4258, at a rate about ten times lower than in the Milky Way. M106, also known as NGC 4258, lies 23.5 million light years away in the constellation Canes Venatici.
It was discovered by Pierre Méchain in 1781. In 1781, the Cepheid variables of other galaxies could not be used to measure the distance because they are in a different metallicity range than the Milky Way. The water masses in M106 made it possible for the first time to directly measure the distance to a galaxy and thus provided an independent anchor for the cosmic distance ranking.