Astronomical Observations
Many astronomical objects are not only observable in visible light but also emit radiation at radio wavelengths. Besides observing energetic objects such as pulsars and quasars, radio telescopes are able to "image" most astronomical objects such as galaxies, nebulae, and even radio emissions from planets.
Read more about this topic: Radio Telescope
Famous quotes containing the word observations:
“I have never yet seen any plan which has not been mended by the observations of those who were much inferior in understanding to the person who took the lead in the business.”
—Edmund Burke (1729–1797)