SDSO-1, a filamentary emission nebula, was discovered near the Andromeda Galaxy (M31) nucleus through extensive amateur astrophotography employing an OIII filter. The nebula exhibits a teal arc of ...
On Oct. 4, 1923, Edwin Hubble took a photographic plate of the Andromeda Nebula (as it was known then) using the 100-inch Hooker telescope at Mount Wilson. The next night, he took another plate and ...
A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the American Astronomical Society in January 1925, a paper read by one of his ...
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