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computer_468x60_b2.gif 05-Jun-2003 15:23 2k computer_468x60_b3.gif 05-Jun-2003 15:23 3k computer_500x350.swf 05-Jun-2003 15:23 23k computerspiele_468x60_01.gif 11-Dec-2003 12:09 6k

21.) computer_500x350.swf

In this lesson, you will begin to see the creation of the quiz engine. This will allow you to exercise the skills shown in the earlier videos. Duration:22 minutes 32 seconds Watch: Visual Basic Video | Visual C# Video Download: Visual Basic Project |

22.) 11 - ASP.NET 2.0 Quiz Engine Project - Designing and Planning.wmv

computer_lg.mov 01-Dec-2003 17:36 16.7M dreams_large.mov 06-Oct-2002 15:36 4.4M fire_lg.mov 02-Dec-2003 15:25 10.6M helmet_lg.mov 02-Dec-2003 16:08 17.2M

23.) fire_lg.mov

1.4MB

24.) c128_announcement_cc_dec_1985.wmv

Dec 20th 2002 [ Looking at Computer Music ] with daddy, a video capture from the web-cam.

25.) arround1.wmv

High Speed

26.) CNdec15_001_strm1.rm

.4MB

27.) toys_r_us_computer_retail_cc_dec_1985.rm

homer.jpg 13-Jan-2005 02:42 2.5K Picture File I will not fix your computer.gif 26-Dec-2004 14:37 3.7K Picture File Levis Banned In Singapore.mpg 05-Sep-2004 22:10 4.4M Lifting Fog.png 16-Oct-2004 19:18 859K

28.) Levis Banned In Singapore.mpg

The nasa.gov site requires that JavaScripts be enabled in your browser. For instructions, click here Text and images site Contact NASA Home Find it at NASA: Enter search term Global Navigation ABOUT NASA NEWS AND EVENTS MULTIMEDIA MISSIONS MyNASA WORK FOR NASA Exploring the Universe Navigation: MAIN FEATURES OUR SOLAR SYSTEM STARS AND GALAXIES WATCH THE SKIES NEW WORLDS ROBOTIC EXPLORERS Choose another category: Life on Earth Humans in Space News History''s Greatest Comet Hunter Discovers 1,000th Comet 08.17.05 One thousand comets have been discovered to date using the Solar and Heliospheric Observatory (SOHO) spacecraft. The SOHO spacecraft, a joint effort between NASA and the European Space Agency, has accounted for approximately one-half of all comet discoveries with computed orbits in the history of astronomy. Image left: SOHO comets 999 and 1,000. Credit: NASA/ESA Click here for a print-resolution image (415 k tif image) Click here for 686 k QuickTime movie Many SOHO comet discoveries have been by amateurs using SOHO images on the internet, and SOHO comet hunters come from all over the world. Toni Scarmato, a high school teacher from Italy, discovered SOHO''s 999th and 1000th comet August 5 when two comets appeared in the same SOHO image. Scarmato, an astrophysics graduate of Bologna University, said I am very happy for this special experience that is possible thanks to the SOHO satellite and NASA-ESA collaboration. I want to dedicate the SOHO 1000th comet to my wife Rosy and my son Kevin to compensate for the time that I have taken from them to search for SOHO comets. Image right: Comet NEAT as seen by SOHO in February 2003. Credit: NASA/ESA Click here for a print-resolution copy (190 k jpg image) Click here for a 2 meg QuickTime movie Click here for a 1.8 meg MPEG movie The SOHO team also held a contest over the internet to guess the time when the 1,000th comet would be discovered. The contest winner is Andrew Dolgopolov of Dublin, Ireland, who guessed the time of the comet''s closest approach to the Sun (perihelion time) within 22 minutes. Image right: This image is from a computer artist''s animation of the breakup of a single comet near the Sun. The fragmenting comet is the white object on the right. Many of the SOHO comets are believed to be fragments of larger comets. Image credit: NASA/Walt Feimer Click here for a 3.5 meg MPEG movie Click here for a 6 meg QuickTime movie Click here for a 16 meg print-resolution copy of this image (tif format) Before SOHO was launched, 16 sungrazing comets had been discovered by space observatories. Based on that experience, who could have predicted that SOHO would discover more than sixty times that number, and in only nine years? This is truly a remarkable achievement! said Dr. Chris St. Cyr, Senior Project Scientist for NASA''s Living With a Star program at NASA Goddard Space Flight Center in Greenbelt, Md. Comets are chunks of ice and dust that zoom around the solar system in elongated orbits. This dirty snowball is the nucleus of the comet. Comet nuclei are thought to be cosmic leftovers, condensed remains of the gas and dust cloud that formed the solar system. Image Left: Comet Machholz 1 passed within 13 million miles (22 million km) of the Sun, unusually close for a comet. This view from Jan. 2002 not only shows the comet in the upper left, but the planet Venus also appears in the lower right. Click on the image for a large movie, or download a QuickTime version. Credit: NASA/ESA. As a comet gets close to the Sun, solar heat liberates gas and dust from the nucleus, forming the coma, which is an extensive, bright cloud around the nucleus, and one or more tails. A comet''s dust tail can become millions of miles (kilometers) long as sunlight pushes the dust particles away from the Sun. Comets also have a tail of electrically charged particles (ions) that is usually fainter and is pushed away from the Sun by the solar wind, a thin stream of electrified gas that blows constantly from the Sun. World Book @ NASA Comet: An icy body that releases gas or dust. + View Article About 85 percent of the SOHO comets discovered so far belong to the Kreutz group of sungrazing comets, so named because their orbits take them very close to the Sun. SOHO''s 999th and 1,000th also belong to the Kreutz group. The Kreutz sungrazers come within 500,000 miles (800,000 km) of the Sun''s visible surface. (Mercury, the planet closest to the Sun, is about 36 million miles (57.6 million km) from the solar surface.) SOHO has also been used to discover three other well-populated comet groups: the Meyer (at least 55 members), Marsden (at least 21 members), and Kracht (24 members) groups. These comet groups are named after the astronomers who suggested that the comets are related because they have similar orbits. Image Right: This Kreutz sungrazing comet from April 1998 was observed in the LASCO C2 telescope. This particular class of comets vaporizes as they plunge into the solar atmosphere. Click on the image for movie, or download QuickTime and print resolution still. Credit: NASA/ESA. Because comets in a group have similar orbits, they are believed to be fragments from a larger comet that broke apart. Sungrazing comets can break up as they approach the Sun due to the Sun''s gravity and heat. It is likely that small fragments continue to break off all around their orbits, because SOHO observes a stream with tiny Kreutz members reaching the Sun almost every day, and bits as small as these would have simply vaporized if this had happened near the Sun. Most of these comet fragments are not visible from Earth because their small size makes them extremely faint. A typical comet nucleus is as big as a mountain, while most of the SOHO comets are only as big as a large room or small house. However, since the Kreutz group is so numerous, the parent comet that shattered to create Kreutz comets is estimated to have been truly immense, about 60 miles (100 km) across. The great comets of 1843 and 1882, with long tails that were spectacular to the naked eye, were large Kreutz members; as was comet Ikeya-Seki in 1965. The 1882 and 1965 comets almost certainly broke off from each other the previous time they were near the Sun, when the combined comet was likely seen as the comet of 1106. SOHO Comet Discovery Milestones: Comet Number Date 100 Feb. 4, 2000 200 Aug. 31, 2000 300 Mar. 25, 2001 400 Feb. 26, 2002 500 Aug. 14, 2002 600 Apr. 29, 2003 700 Dec. 2, 2003 800 June 11, 2004 897 Jan. 13, 2005 Almost all SOHO''s comets are discovered using images from its Large Angle and Spectrometric Coronagraph (LASCO) instrument. LASCO is used to observe the faint, multimillion-degree outer atmosphere of the Sun, called the corona. A disk in the instrument is used to make an artificial eclipse, blocking direct light from the Sun so the much fainter corona can be seen. Sungrazing comets are discovered when they enter LASCO''s field of view as they pass close by the Sun. Building coronagraphs like LASCO is still more art than science, because the light we are trying to detect is very faint, said Dr. Joe Gurman, U.S. Project Scientist for SOHO at NASA Goddard. Any imperfections in the optics or dust in the instrument will scatter the light, making the images too noisy to be useful. Discovering 1,000 comets since SOHO''s launch on December 2, 1995 is a testament to the skill of the LASCO team. SOHO successfully completed its primary mission in April 1998, and it has enough fuel to remain on station and keep hunting comets for decades, assuming the LASCO instrument continues to function. Additionally, NASA''s twin Solar Terrestrial Relations Observatory (STEREO) spacecraft, scheduled for launch in February 2006, each have two instruments that could be used to discover comets: a coronagraph like LASCO and a heliospheric imager. More Information: + SOHO comets: images and more information + Watch the Sun in Real-Time from SOHO + SOHO Spots Flare Within Minutes of the New Year + Best Comet Movies from SOHO + Comet Bradfield + Two Comets Race for the Sun + Comet NEAT + Comet Kudo Fujikawa Bill Steigerwald NASA Goddard Space Flight Center + Inspector General Hotline + Equal Employment Opportunity Data Posted Pursuant to the No Fear Act + Budgets, Strategic Plans and Accountability Reports + Freedom of Information Act + The President''s Management Agenda + NASA Privacy Statement, Disclaimer, and Accessibility Certification Editor: Lynn Jenner NASA Official: Brian Dunbar Last Updated: August 17, 2005 + Contact NASA 105637main lasco010802 lg NASA - History''s Greatest Comet Hunter Discovers 1,000th Comet text only site