Walking home from University of Colorado campus. Looked up while about to cross the street and saw a glowing, pulsating, white/yellowish orb above Boulder's flatirons (foothills). This orb appeared to be identical to much other footage I have seen of such things, however it appeared by itself whereas the majority of other footage seems to include more than one orb. I viewed the object for about 10 min total. I decided to go onto the rooftop of a nearby building to get a better view, but when I did so, the