日期：2008-07-30 Why does the sun look red at sun-rise and sunset？ When the sun rises and sets， it goes through a very thick layer of air and a lot of sun-light is absorbed by air. That's why it looks red. Actually， the white sunlight is formed by the seven colour... 阅读全文>>

日期：2008-07-30 Of all the stars that can give out light and heat， the sun is neither the biggest， nor the smallest. It appears very big because it is the closest star to us. The sun is much bigger than the earth. Its diameter is 1.4 million kilometres. If we cou... 阅读全文>>

日期：2008-07-30 A lot of animals are afraid during an eclipse1 of the sun. Birds stop singing. Sometimes people too are afraid. Astronomers2 know the dates of eclipses and they are not afraid. The old astronomers of Babylon and Egypt had no telescopes3； but the sk... 阅读全文>>

日期：2008-07-30 When most people think of space， what come to mind are names like John Glenn and Neil Armstrong. When scientists think about space， the name that comes to mind is Hubble， a space telescope we sent on a twenty-year Journey to explore the origins o... 阅读全文>>

日期：2008-07-30 There is a Woman in the Moon but many people have never seen her. She is much more obvious than the Man in the Moon. Seen in profile, the appearance of The Woman in the Moon changes with varying light.... 阅读全文>>

日期：2008-07-30 [11] Muller's breakthrough was to find a way to date how long ago any particle was meltedmeaning he could build up a picture of whether the moon gets a constant barrage or suffers spells of intense bombardment. [12] He said; The evidence clearly sho... 阅读全文>>

日期：2008-07-30 [6] One group, led by John Matese, professor of physics at the University of Louisiana at Lafayette, confirms the notion that it is most likely to be a brown dwarf, a star that never accumulated enough mass to ignite and which has simply sat in spac... 阅读全文>>

日期：2008-07-30 [1] When the end of the world comes, we'll know what to blame. Scientists have found compelling evidence that the Sun has a baby brother, a dark star whose eccentric orbit is responsible for periodically showering the Earth with comets and meteorite... 阅读全文>>

日期：2008-07-30 ST. LOUIS, Missouri (AP) Scientists said Monday they have begun slicing and dicing the first of hundreds of microscopic specks of comet dust, virtually unchanged since the birth of the solar system, that a NASA spacecraft successfully returned to Ea... 阅读全文>>

日期：2008-07-30 (SPACE.com) The two moons discovered around Pluto last year were likely formed from the same giant impact that created the planet's much larger satellite, Charon, scientists say. The idea suggests that other Kuiper Belt Objects might also harbor mul... 阅读全文>>

日期：2008-07-30 Miranda is the eleventh of Uranus's known satellites. Miranda is the innermost of Uranus' large moons. orbit: 129,850 km from Uranus diameter: 472 km mass: 6.3e19 kg Miranda is a daughter of the magician Prospero in Shakespeare's The Tempest. Discov... 阅读全文>>

日期：2008-07-30 Puck is the tenth of Uranus' known satellites: orbit: 86,006 km from Uranus diameter: 154 km Puck is a mischievous fairy in Shakespeare's Midsummer-Night's Dream. Discovered by Voyager 2 in 1986. Of the 10 new Uranian moons discovered by Voyager 2,... 阅读全文>>

日期：2008-07-30 Belinda is the ninth of Uranus' known satellites: orbit: 75,255 km from Uranus diameter: 68 km Belinda is the heroine in Alexander Pope's The Rape of the Lock. Discovered by Voyager 2 in 1986. 天卫十四在已知天王星卫星中距其第九近： 公转轨道：75,255... 阅读全文>>

日期：2008-07-30 Rosalind is the eighth of Uranus' known satellites: orbit: 69,927 km from Uranus diameter: 54 km Rosalind is a daughter of the banished Duke in Shakespeare's As You Like It. Discovered by Voyager 2 in 1986. 天卫十三在已知天王星卫星中距其第八近： 公... 阅读全文>>

日期：2008-07-30 Portia is the seventh of Uranus' known satellites: orbit: 66,097 km from Uranus diameter: 110 km Portia is a rich heiress in Shakespeare's Merchant of Venice. Discovered by Voyager 2 in 1986. 天卫十二在已知天王星卫星中距其第七近： 公转轨道：66,097 k... 阅读全文>>

日期：2008-07-30 Juliet is the sixth of Uranus' known satellites: orbit: 64,358 km from Uranus diameter: 84 km Juliet is the tragic heroine in Shakespeare's Romeo and Juliet. Discovered by Voyager 2 in 1986. 天卫十一在已知天王星卫星中距其第六近： 公转轨道：64,358 km... 阅读全文>>

日期：2008-07-30 Desdemona is the fifth of Uranus' known satellites: orbit: 62,659 km from Uranus diameter: 58 km Desdemona is the wife of Othello in Shakespeare's Othello. Discovered by Voyager 2 in 1986. 天卫十在已知天王星卫星中距其第五近： 公转轨道：62,659 km fro... 阅读全文>>

日期：2008-07-30 Cressida is the fourth of Uranus' known satellites: orbit: 61,767 km from Uranus diameter: 66 km Cressida is the daughter of Calchas in Shakespeare's Troilus and Cressida. Discovered by Voyager 2 in 1986. 天卫九在已知天王星卫星中距其第四近： 公转轨... 阅读全文>>

日期：2008-07-30 Bianca is the third of Uranus' known satellites: orbit: 59,165 km from Uranus diameter: 44 km Bianca is the sister of Katherine in Shakespeare's Taming of the Shrew. Discovered by Voyager 2 in 1986. 天卫八在已知天王星卫星中距其第三近： 公转轨道：59,... 阅读全文>>

日期：2008-07-30 Ophelia is the second of Uranus' known satellites: orbit: 53,764 km from Uranus diameter: 32 km Ophelia is the daughter of Polonius in Shakespeare's Hamlet. Discovered by Voyager 2 in 1986. Ophelia appears to be the outer shepherding satellite for U... 阅读全文>>