An astronomer is a person who studies celestial objects, such as stars, planets, and galaxies, to gain a better understanding of the universe. Full definition
The cloud rotating into view at the lower - right limb grew into the large storm that was seen by amateur astronomers at visible wavelengths. (keckobservatory.org)
A team of astronomers says it has found a new and remarkably simple way to measure the mass of a black hole: examine the shape of its home galaxy. (sciencemag.org)
This age, however, differs significantly from the age estimated by another method which has been used by astronomers for decades. (public.nrao.edu)