General
The measured distance to the Andromeda Galaxy was doubled in 1953 when it was discovered that there is another, dimmer type of Cepheid. In the 1990s, measurements of both standard red giants as well as red clump stars from the Hipparcos satellite measurements were used to calibrate the Cepheid distances.
Read more about this topic: Andromeda Galaxy
Famous quotes containing the word general:
“Through the particular, in wartime, I felt the high-voltage current of the general pass.”
—Elizabeth Bowen (1899–1973)
“Could anything be more indicative of a slight but general insanity than the aspect of the crowd on the streets of Chicago?”
—Charles Horton Cooley (1864–1929)
“Mathematics is merely the means to a general and ultimate knowledge of man.”
—Friedrich Nietzsche (1844–1900)