SSS 2010-04-29

This is Scientific American's 60-Second Science. I'm Karen Hopkin. Thisll just take a minute. Any school kid can tell you that comets are made of ice. That frozen water burning off is what gives comets their characteristic tails. But asteroids were g

SSS 2009-01-06

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. If we want to learn more about our planet and other planets in the universe, we can get some help from stars that are long dead and gone. Thats what U.

NPR 2010-06-14

The government's point man for responding to the Gulf Coast oil spill disaster says he expects BP to offer a new improved containment plan as early as today. NPR's Neda Ulaby has more. Admiral Thad Allen of the US Coast Guard appeared on CBS's Face T

NASA's WISE satellite spots "horseshoe" asteroid

LOS ANGELES, April 8 (Xinhua) -- NASA's Wide-field Infrared Survey Explorer (WISE) has discovered a rare asteroid that traces out a horseshoe shape relative to Earth, the Jet Propulsion Laboratory (JPL) said on Friday. Unlike most near-Earth asteroid

2007年VOA标准英语-Rice Seeks Momentum in Israeli-Palestinian Peac

By David Gollust Jerusalem 01 August 2007 U.S. Secretary of State Condoleezza Rice held talks with senior Israeli officials Wednesday to try to restore momentum to the Israeli-Palestinian peace process. She came to Jerusalem from Saudi Arabia, where

2006年VOA标准英语-Italy Arrests Group Suspected of Aiding Al

By Sabina Castelfranco Naples 19 April 2006 Chouimet Amirouche, front at center, and Mellouk Djelloul, rear at center with his face covered, both of Algeria, are detained by Italian police officers, i

VOA标准英语2013--NASA: Humans Could Visit Asteroid in 2021

NASA: Humans Could Visit Asteroid in 2021 These chunks of ancient space rocks hold clues about the formation of the universe, pose threats to our planet, and present new territory for explorers. NASA's proposed asteroid mission is a logical next leap

美国国家公共电台 NPR Asteroid Impact That Wiped Out The Dinosaurs Also Caused Abrupt Global Warming

ARI SHAPIRO, HOST: A giant asteroid slammed into Earth about 65 million years ago. That impact killed off the dinosaurs. And now scientists say it had another major effect on the planet, one that's a cautionary tale. Here's NPR's Nell Greenfieldboyce

美国国家公共电台 NPR NASA Launches Mission To Retrieve Ancient Asteroid Dust

NASA Launches Mission To Retrieve Ancient Asteroid Dust play pause stop mute unmute max volume 00:0003:12repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin.

美国国家公共电台 NPR NASA's Other Asteroid Mission: Grab A Chunk And Put It In Orbit Around The Moon

NASA's Other Asteroid Mission: Grab A Chunk And Put It In Orbit Around The Moon play pause stop mute unmute max volume 00:0004:02repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or up

Small asteroid to pass Earth: NASA

LOS ANGELES, June 24 (Xinhua) -- Near-Earth asteroid 2011 MD will whip past Earth on June 27, but will not pose any threat, NASA's Jet Propulsion Laboratory (JPL) said on Friday. The asteroid will pass only 12,000 kilometers (7,500 miles) above the E

2006年VOA标准英语-Asteroid Approaches Earth: Destruction or Delig

By Paul Sisco Washington, DC 07 July 2006 watch Asteroid report A major asteroid passed by the Earth this week, and another is heading this way. An asteroid visible in the night sky Asteroids are similar to comets and meteors. But they are larger, m

2006年VOA标准英语-Large Asteroid Has 'Close' Brush with Earth

By Mike O'Sullivan Los Angeles 03 July 2006 A large asteroid, known as 2004 XP14, raced past the Earth early Monday. Scientists say it posed no threat to the planet, but serves as a reminder of the hazards encountered in space. -------- The rocky sp

2007年VOA标准英语-Pain of Partition Lingers 60 Years After Indepe

By Steve Herman New Delhi 14 August 2007 An electrician checks the decorative lights on the Indian gate, at the joint border check post, Wagah, India, 13 Aug 2007 Sixty years ago, India and Pakistan celebrated their newly won independence from Britis

2007年VOA标准英语-Analysts Examine Possibility for Middle East Pe

By Sean Maroney New York 20 June 2007 In 1967, Israel countered what it saw as a threat of annihilation by its neighbors and defeated three Arab armies in six days. As a result, Israel nearly tripled the terroritory under its control and began an occ

Huge asteroid will pass closer to Earth than the moon

BEIJING, Nov. 7 (Xinhuanet) -- A huge asteroid will pass closer to Earth than the moon on Tuesday, but experts say there is no cause for alarm. Asteroid 2005 YU 55 will pass about 300-thousand kilometers from the earth. The giant space rock is about

Asteroid buzzes Earth harmlessly

BEIJING, June 28 (Xinhuanet) -- A truck-sized asteroid passed over the Atlantic Ocean within 7,500 miles of the Earth on Monday, according to NASA's Jet Propulsion Laboratory. The space rock, called asteroid 2011 MD, is the second space rock to zip e

英闻天下——259 NASA Says Asteroid Will Get Closer to Earth

NASA has announced that an Asteroid will pass closer to Earth than the TV satellites that surround the planet. NASA says that the celestial visitor has no chance of impacting the Earth and is known as 2012 DA14. A group of amatuer astronomers discove

英闻天下——283 An Asteroid Misses Earth, Causes No Public Panic

Meanwhile, a 45-meter wide asteroid has hurtled safely past earth after it came within 27-thousand kilometers, making it the closest known flyby for a rock of its size. The asteroid, named 2012 DA14 came closer to earth than many communication and we

新GRE填空三空练习题

1. In Democracies and its Critics, Robert Dahl defends both democratic value and pluralist democracies, or polyarchies. Dahl argues convincingly that the idea of democracy rests on political equalitythe equality capacity of all citizens to determine