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The sands of time are running out for the central star of this the Hourglass Nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a sun-like star's life occurs as its outer layers are ejected and its core becomes a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the 'hourglass.' The unprecedented sharpness of Hubble's images revealed surprising details of the nebula ejection process and may resolve the outstanding mystery of the variety of complex shapes and symmetries of planetary nebulae. Image Credit: NASA, WFPC2, HST, R. Sahai and J. Trauger (JPL)
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Archive for July 15th, 2010
Solar Eclipse 2010
The total solar eclipse of July 11, 2010 occurred over the southern Pacific Ocean. The eclipse was one of the most remote in recorded history. It was visible over much of the southern Pacific Ocean, touching several atolls in French Polynesia, the Cook Islands, Easter Island, and Argentina’s Patagonian plains.
Total eclipse began 700 kilometers (440 miles) southeast of Tonga at approximately 18:15 UTC and reached Easter Island by 20:11 UTC. The global sky photography project The World At Night stationed photographers throughout the eclipse’s visibility track. Eclipse chasers photographed the event onboard a chartered airplane, cruise ships, numerous Pacific islands, and in Argentina’s Patagonia region. Totality was observed for four minutes and 41 seconds (4:41) on Easter Island, where it was observed for the first time in 1,400 years. Approximately 4,000 observers visited Easter Island for this eclipse, prompting an increase in security at its important moai archeological sites. The eclipse occurred at the same time that the final game of the 2010 FIFA World Cup was being played in South Africa, and many soccer fans in Tahiti watched the match instead of observing the partial eclipse with a high percentage of obscuring the sun by about 98 percent. The path of totality of this eclipse barely missed some significant inhabited islands, including passing just about 20 km north of the northern end of Tahiti.
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