Astronomy on MSN

What is the origin of the letters used in star classification?

What is the origin of the letters used in star classification? Why didn't astronomers use ABCD? J. HaldimanChicago, Illinois ...
insider.si.edu

Source book in astronomy, 1900-1950

Instrumentation -- The 200-inch reflector on Mount Palomar / George Ellery Hale -- A new type of mirror system / Bernhardt Schmidt -- Invention of the coronagraph / Berhard Lyot -- A stratospheric ...
来自MSN

Hubble Has Discovered a Mysterious Star in the Milky Way, Dubbed the ‘Blue Lurker ...

In 2025, one might assume that all types of stars in the Milky Way have been cataloged, yet the universe continues to surprise us. In 1953, American astronomer Alan Sandage revolutionized our ...