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Once it was discovered about 300 years ago that stars have "proper motion", and appear to move very slowly over the celestial sphere in random difections and random apparent speeds, it was realized that the stars were all moving in three dimensional space. And if all stars have the same actual velocity in space, or velocities within a relatively ...


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You can visit IncliNET which is a Web application that uses the power of Convolutional Neural Networks to evaluate the inclination of spiral galaxies. This online GUI allows users to submit a galaxy image through various methods. https://edd.ifa.hawaii.edu/inclinet/ 1. Galaxy PGC ID Entering the name of a galaxy by querying its PGC number (the ID of galaxy ...


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It is not true that "dead", or quenched galaxies cannot start forming stars again. It is called rejuvenation and is observed occasionally (e.g. Chauke et al. 2019), although not commonly (Akhshik et al. 2021). It is also seen in simulations, where some quiescent galaxies return to the star-forming main sequence (Behroozi et al. 2019). Quenching ...


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Interesting that you ask this question after reading this article from NASA. The same agency also published this article on the number of stars in the Milky Way. The article then links to three other interesting articles. I don't want to repeat the article in this post, please read it, but the main take away of the article is that there is no exact number of ...


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