We can measure the magnetic fields in galaxies using a number of observational techniques, including measurements of the polarization…
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Are We Seeing the Andromeda Galaxy as it Was 2.5 Million Years Ago?
You are correct. Due to the “universal speed limit” for the transport of information in the universe, the speed…

Voids in Space
There are a number of “voids” in the universe, which are regions which have comparatively few galaxies within them,…

Why Don’t All Objects in the Milky Way Rotate Around the Black Hole at the Center of our Galaxy?
The gravitational force has a distance dependence to it that makes it decrease as you get further away from…

Does a Galaxy’s Distance from us Correlate with its Age?
The observed expansion of our universe allows us to see galaxies as they were when our universe was younger. …
Why Do Galaxies Within a Given Type Have a Variety of Shapes?
Question: Although there are just a few types of galaxies (spiral, elliptic, irregular) why are there so many different…