Category: astronomy...

identifying a new astronomical phenomenon
the origin, evolution, composition, distance, and motion of all bodies and scattered matter in the universe
the impact of the invention of the telescope and discovery of the laws of motion and gravity in the 17th century
The Kitt Peak National Observatory on a 6,900-foot mountain in Arizona; observatories are located at high altitudes because the atmosphere distorts light and electro-magnetic radiation from space
planetary geology, interplanetary dust, stellar development, galaxy formation, quasars
astronomy being constrained by inherently being observational rather than an experimental science
astronomy is from Greek aston 'star' and nomia 'arrangement'
a cosmosphere depicting the celestial sky
a Persian astrolabe, Japanese sundial, and a spectroscope with its series of prisms
the view of the stars from Earth changing remarkably little during the past 10,000 years
The entranceway of Stonehenge being aligned approximately upon the sunrise at the summer solstice -- possibly making Stonehenge also a complicated computer for predicting solar and lunar eclipses
The human eye was used as the first astronomical detector. The eye is about one percent efficient at detecting visible light (99% is not detected).
finding the pole (north) star
navigating by the stars