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ESA – It’s all relative

December 30, 2023
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ESA – It’s all relative
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This Hubble Image of the Week encompasses a richness of spiral galaxies: the big, outstanding spiral galaxy on the correct facet of the picture is NGC 1356; the 2 apparently smaller spiral galaxies flanking it are LEDA 467699 (above it) and LEDA 95415 (very shut at its left) respectively; and eventually, IC 1947 sits alongside the left facet of the picture. 

This picture is a very fascinating instance of how difficult it may be to inform whether or not two galaxies are literally shut collectively, or simply appear to be from our perspective right here on Earth. A fast look at this picture would probably lead you to suppose that NGC 1356, LEDA 467699 and LEDA 95415 had been all shut companions, while IC 1947 was extra distant. Nonetheless, we’ve got to keep in mind that two-dimensional photos resembling this one solely give a sign of angular separation: that’s, how objects are unfold throughout the sphere of the evening sky. What they can not characterize is the space objects are from Earth. 

As an example, while NGC 1356 and LEDA 95415 seem like so shut that they need to absolutely be interacting, the previous is about 550 million light-years from Earth and the latter is roughly 840 million light-years away, so there may be almost a whopping 300 million light-year separation between them. That additionally implies that LEDA 95415 is probably going nowhere close to as a lot smaller than NGC 1356 because it seems to be.

Alternatively, while NGC 1356 and IC 1947 appear to be separated by a relative gulf on this picture, IC 1947 is simply about 500 million light-years from Earth. The angular distance obvious between them on this picture solely works out to lower than 4 hundred thousand light-years, so they’re really a lot a lot nearer neighbours in three-dimensional house than NGC 1356 and LEDA 95415!

[Image Description: A collection of galaxies. On the left side a large spiral galaxy with swirling, twisted arms is flanked by a smaller, but still detailed, spiral behind its arm on the left, and a smaller spiral above it. On the right side is a fourth, round spiral galaxy seen face-on. Between them lies a single bright star. Several stars and distant galaxies dot the background.]



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