Word: orbit
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...century begins in 1911 when Ernest Rutherford disproved, through relatively simple experiments, the dominant scientific theories which viewed the atom as a "large, soft and spongy pudding with electrons embedded in it." Rutherford concluded instead that there was a hard and heavy center to the atom, around which electrons orbit...
This discovery eventually led to the simple model of the atom which is still taught in high school physics courses: the nucleus consists of positively charged protons and uncharged neutrons, around which negatively charged electrons orbit. Yet the continuous discovery of new particles, such as the unstable muon, challenged this simple theory. In addition, this theory raised further theoretical questions: how was the nucleus held together? Why did radioactive decay exist...
...science in the space program, but the space program is not science; there is technological fallout, but it's not about technology. It's about, or should be about, consciousness and the mystery of our own destiny. The space truck to nowhere, sophisticated as it is, gets us to orbit but doesn't give us any lift...
After a 32- month hiatus, the refurbished shuttle and its veteran five- man crew pass a crucial flight test, send a vital communications satellite into perfect orbit, and help Americans overcome their post- Challenger blues. But can NASA meet its new shuttle launch schedule? And can the U. S. afford expensive shuttle missions for tasks that rockets can do more cheaply? See SPACE...
...rockets roared, and the shuttle is in orbit, but the U. S. space effort is only going in circles. How to soar once more...