Observation History
This PPN was first noticed in the IRAS survey due to its exceptionally cold IRAS color temperatures. It also has a uniquely sharp maximum at 60-μM.
Read more about this topic: Frosty Leo Nebula
Famous quotes containing the words observation and/or history:
“That observation which is called knowledge of the world will be found much more frequently to make men cunning than good.”
—Samuel Johnson (1709–1784)
“So in accepting the leading of the sentiments, it is not what we believe concerning the immortality of the soul, or the like, but the universal impulse to believe, that is the material circumstance, and is the principal fact in this history of the globe.”
—Ralph Waldo Emerson (1803–1882)