M31’s Radial Velocity
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For M31, Wikipedia gave the following: M31’s Radial Velocity: The Andromeda Galaxy (M31) is moving toward us with a radial speed of roughly 300 km/s. (Sometimes you’ll see a value around…
The 20 Metre Skynet Radio Dish at Green Bank Observatory
M31 “Radio Map” using data from Green Bank 20m Radio Telescope 13/03/25
My first “map” of M31 – results of my first observing programme using the 20m dish at Green Bank Observatory. The spectra show a clear change in Doppler shift with…