| Windows_to_the_Universe__Neutron_Stars A typical neutron star is the size of a small city, but it may have the mass of as many as three suns. |
| X-ray_Astronomy__Neutron_Stars Brief description of neutron stars. |
| Angiosperm_Phylogeny Phylogenetic trees, technical descriptions of all orders and families, references, and links. By Peter Stevens of the Missouri Botanical Garden. |
| Angiosperms_Image_Gallery Extensive collection, organized by family. |
| The_Families_of_Flowering_Plants A taxonomical database with descriptions and illustrations of each family, and an interactive key to families. |
| Flowering_Plant_Gateway Various paths for exploration or comparison of four major flowering plant classification systems (Cronquist, Takhtajan, Thorne and the Angiosperm Phylogeny Group system). From Texas A&M University |
| OSU_Seed_Biology_Program_-_SeedID_Index Photographs of the seeds of selected plants. |
| CPC_-_La_Niña_Coverage Regularly updated discussion and coverage of the La Niña weather system including global and regional impacts and forecasting. |
| CPC_El_Niño/Southern_Oscillation_(ENSO) Coverage of the 1997/98 El Niño weather system from the Climate Prediction Centre, including forecasts, historical info, and the impact of the system on weather patterns. |
| El_Niño_and_La_Niña__Tracing_the_Dance_of_Ocean_and_Atmosphere National Academies popular article describes the basic scientific research that led to our current understanding of these weather phenomenon. |
| El_Niño/La_Niña_Watch Archive of images and news releases about observations of the El Nino/La Nina phenomenon in the Pacific Ocean by the U.S./French TOPEX/Poseidon, Jason-1, and other NASA/JPL satellites and instruments. |
| The_Potential_Use_and_Misuse_of_El_Niño_Information A workshop report from the Environmental and Social Impacts Group. Includes compilation of documents including an executive summary and a glossary. |
| What_is_an_El_Niño? Illustrated explanation with realtime graphics and animations of data from the tropical Pacific Ocean. From NOAA. |
| What_is_La_Niña? Illustrated explanation with realtime graphics and animations of data. Also numerous links to reference material from NOAA. |
| Atlas_of_the_Moon Interactive Moon atlas (hotspots) with links to 237 close-up images. [Also in German] |
| The_Captive_Moon Offers overview article including exploration history and cultural history. |
| Dyson\'s_Animated_Moon Interative moon map (Flash based) with brief information about various features. |
| Earth-Moon_Dynamics_Page Extracts from five papers studying Earth-Moon dynamics relating to evolution and gravity topics. |
| Geologic_Lunar_Research_Group Resource for all lunar observers interested in geologic, dome and TLP research. Some content in Italian. |
| Google_Moon A photographic map of the equatorial region with pan and zoom capability, showing locations of the Apollo landings. |
| Interactive_Map_of_the_Moon The visible and the hidden side. Includes games and basic information about the satellite and the lunar missions. |
| Keith\'s_Moon_Page A collection of facts, phases, folklore and photographs. |
| Lunar_Volcanoes An Introduction to Lunar Domes by Nigel Longshaw, an illustrated description of these features including characteristics and observation history. |
| Lunarsat_Info_Page Multimedia presentation of the European space mission to investigate the south pole for its suitability for the first permanent human outpost. |
| The_Moon_Illusion_Explained Why our satellite looks big at the horizon and smaller when higher up. |
| The_Moon_Museum A tour made on the 30th anniversary of the first lunar landing. |
| Moon_Page Some facts, quotations, trivia chosen at random. |
| Moon_Stereogram_Demonstration Demonstration as to why the Moon appears larger when nearer the horizon than when high in the sky. |
| Moon_Survey Tips for observing our satellite and drawing lunar features. Data archive, pictures, movies and selected links also available. |
| MoonBase7 Facts, missions, phases, news, links. Also dedicated to the space in general and robotics. |
| NSSDC_Photo_Gallery__Moon Select images from various space probes and telescopes. |
| The_Origin_of_the_Moon Scientific research report providing overview of current theories. |
| SMART-1__ESA\'s_Mission_to_the_Moon Official mission site includes articles, images, FLASH presentation, PDF brochures, etc. |
| Summer_Moon_Illusion An explanation of the illusion that the Moon, low on the horizon, is actually bigger then when seen higher in the sky. |
| What\'s_a_Blue_Moon? From Sky and Telescope magazine. Explains what it is and when the phenomenon happens. |
| Woman_in_the_Moon Several features of lunar landscape combined can be seen as a profile of a woman. |
| April_3_1974 Details on the Super Outbreak of Tornadoes that spawned 148 tornadoes, including thirty F4's and six F5's, in one day. |
| Bangladesh_and_East_India_Tornado_Prediction_Page A climatology of tornadoes for east India and Bangladesh, and the daily prediction of tornadoes are provided. Surface and upper air charts for historical tornado cases for Bangladesh and India are pr |
| The_Disaster_Center_Tornado_and_Severe_Weather Tornadoes, weather watchers, fact sheet statistics for every state, and links to the Disaster Center states pages. |
| FEMA_-_Fact_Sheet_-_Tornadoes Tornado safety tips from the Federal Emergency Management Agency. |
this should make a neutron star. or else, if it is too massive, it could make a black hole.
One can look for a neutron star at the center. There is one.It has a period of 0.033 s = 33 ms, with one strong pulse andone weak pulse each period. The pulses are seen in radio emissions (as always for pulsars). It is also seen in visible light. The star winks on twice each 33 ms. It is also seen in X-rays.
2)Vela PulsarThe Gum Nebula in the constellation Vela is another supernova remnant.It also contains a pulsar, with a period of 89 ms. It can also beseen in X-ray, optical, and radio wavelenghts.Davison E. Soper, Institute of Theoretical Science,University of Oregon, Eugene OR 97403 USAsoper@bovine.uoregon.edu