1989 In Science
The year 1989 in science and technology involved many significant events, some listed below. Astronomy * August – Asteroid 4769 Castalia is the first asteroid directly imaged, by radar from Arecibo. * August 25 – The ''Voyager 2'' spacecraft makes its closest approach to Neptune, providing definitive proof of the planet's rings. * September 5 – Pluto–Charon barycentre comes to perihelion. * Asteroid 5128 Wakabayashi is discovered by Masahiro Koishikawa. *4292 Aoba is discovered. * 4871 Riverside is discovered. *6089 Izumi is discovered. *6190 Rennes is discovered *8084 Dallas is discovered. Biology * Discovery of the cystic fibrosis trans-membrane conductance regulator gene. * The New Zealand Department of Conservation begins to implement a Kakapo Recovery Plan. Computer science * March 12 - Tim Berners-Lee submits a memorandum, titled "Information Management: A Proposal", to the management at CERN for a system that would eventually become the World Wide Web. * June ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Asteroid
An asteroid is a minor planet of the Solar System#Inner solar system, inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. Of the roughly one million known asteroids the greatest number are located between the orbits of Mars and Jupiter, approximately 2 to 4 astronomical unit, AU from the Sun, in the main asteroid belt. Asteroids are generally classified to be of three types: C-type asteroid, C-type, M-type asteroid, M-type, and S-type asteroid, S-type. These were named after and are generally identified with carbonaceous, metallic, and silicaceous composit