[ti:Scientists Aim to Land New Telescope on Far Side of the Moon]
[by:www.21voa.com]
[00:00.00]更多听力请访问21VOA.COM
[00:00.04]American scientists are working
[00:02.88]to develop a telescope to deploy on the moon.
[00:08.00]The telescope is designed to search for ancient radio waves
[00:13.92]that could provide important details about the early universe.
[00:19.44]The American space agency NASA
[00:23.48]and the U.S. Department of Energy
[00:26.40]are working together on the project.
[00:29.64]The telescope will be the first designed to collect data
[00:35.52]on a historical period of the universe called the Dark Ages.
[00:41.32]This period is considered important to study
[00:45.96]because it can provide new details about the formation
[00:51.00]and development of the universe.
[00:55.20]The Dark Ages period began nearly 380,000 years
[01:01.88]after the Big Bang,
[01:03.84]the explosion many scientists believe created the universe.
[01:09.48]During the Dark Ages, there were no stars or planets.
[01:15.72]In a statement announcing the project, NASA said
[01:20.28]information on the Dark Ages can only be learned
[01:24.96]through data collected from radio waves.
[01:28.80]The new telescope is specially designed to provide details
[01:34.48]on the formation of the early universe.
[01:38.40]The telescope is to be placed on
[01:41.76]what is known as the far side of the moon.
[01:45.48]This description came about because
[01:49.08]that side of the moon cannot be seen from Earth.
[01:53.16]The area does experience its own day and night cycle.
[02:00.64]The far side of the moon enjoys radio silence compared to Earth,
[02:07.00]which experiences so much radio wave traffic
[02:11.72]it is considered noise "pollution."
[02:15.12]It offers an unusual environment that permits researchers
[02:20.60]to record sensitive radio signals.
[02:23.84]Team members say such signals
[02:27.92]cannot be captured anywhere else in near-Earth space.
[02:33.52]Anze Slosar is a physicist
[02:37.64]with the Department of Energy's
[02:39.72]Brookhaven National Laboratory in New York.
[02:43.96]He said in a statement that studying the universe is easier
[02:50.08]when collecting data from a time before the stars and planets formed.
[02:57.04]"So far, we can only make predictions about earlier stages of the universe
[03:03.52]using a benchmark called the cosmic microwave background," Slosar said.
[03:12.32]He noted that the new telescope would provide a new benchmark,
[03:17.92]opening the door for scientists
[03:20.84]to make further important discoveries about the universe.
[03:25.84]After touching down on the moon, the telescope's lander
[03:30.60]will turn off permanently so it does not produce any wave interference.
[03:37.08]The telescope will then deploy four three-meter-long antennas.
[03:43.76]The instrument must survive the severe conditions
[03:48.16]existing on the moon's far side.
[03:51.76]Scientists on Earth will have to wait 40 days for the telescope
[03:57.96]to collect and send its first data to a satellite
[04:02.32]that can communicate with Earth.
[04:06.00]Researchers leading the project say multiple big discoveries
[04:11.32]could be made in the future with the lunar telescope.
[04:16.64]"Radio emission from the galaxy is very bright
[04:21.08]and our Dark Ages signal is hiding behind it,"
[04:25.44]said physicist Stuart D. Bale of the University of California, Berkeley.
[04:32.12]Paul O'Connor is a scientist
[04:35.52]with Brookhaven's Instrumentation Division
[04:39.16]who is helping lead the project.
[04:41.88]"The moon is easier to reach than Mars,
[04:46.68]but everything else is more challenging,"
[04:50.12]he said about the operating environment on the moon.
[04:54.00]O'Connor added that removing heat and avoiding radiation
[04:59.88]are some of the main challenges faced when exploring from the moon.
[05:05.36]"There's a reason only one robotic rover has landed on the Moon
[05:10.92]in the last 50 years, while six went to Mars,
[05:15.76]which is 100 times farther away," O'Connor said.
[05:21.36]I'm Bryan Lynn. 更多听力请访问21VOA.COM
END OF TRACK. "END OF TRACK." The two men bowed. "Whoever was that person you were talking to?" she enquired, as soon as they stood together. The took of triumph faded from her eyes, she had grown worn and weary. The roses were wilting on the walls, the lights were mostly down now. Hetty, looking in to see if anything was wanted, found herself driven away almost fiercely. I only saw Master Jervie once when he called at tea time, The year 1747 was opened by measures of restriction. The House of Lords, offended at the publication of the proceedings of the trial of Lord Lovat, summoned the parties to their bar, committed them to prison, and refused to liberate them till they had pledged themselves not to repeat the offence, and had paid very heavy fees. The consequence of this was that the transactions of the Peers were almost entirely suppressed for nearly thirty years from this time, and we draw our knowledge of them chiefly from notes taken by Horace Walpole and Lord Chancellor Hardwicke. What is still more remarkable, the reports of the House of Commons, being taken by stealth, and on the merest sufferance, are of the most meagre kind, sometimes altogether wanting, and the speeches are given uniformly under fictitious names; for to have attributed to Pitt or Pelham their[112] speeches by name would have brought down on the printers the summary vengeance of the House. Many of the members complained bitterly of this breach of the privileges of Parliament, and of "being put into print by low fellows"; but Pelham had the sense to tolerate them, saying, "Let them alone; they make better speeches for us than we can make for ourselves." Altogether, the House of Commons exhibited the most deplorable aspect that can be conceived. The Ministry had pursued Walpole's system of buying up opponents by place, or pension, or secret service money, till there was no life left in the House. Ministers passed their measures without troubling themselves to say much in their behalf; and the opposition dwindled to Sir John Hinde Cotton, now dismissed from office, and a feeble remnant of Jacobites raised but miserable resistance. In vain the Prince of Wales and the secret instigations of Bolingbroke and Doddington stimulated the spirit of discontent; both Houses had degenerated into most silent and insignificant arenas of very commonplace business. "It certainly will be. Miss Widgeon," answered Maria, with strictly "company manners." "One who has never had a brother exposed to the constant dangers of army life can hardly understand how glad we all feel to have Si snatched from the very jaws of death and brung back to us." "Just plug at 'em as you would at a crow, and then go on your way whistlin'?" persisted Harry. "Hurroo!" echoed Hennessey; "that's the ticket." "Come forward, keeper," continued the baron, "and state how these arrows came into your hands!" "Yes." HoMEJULIA京香2018下载
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