外星人可能用宇宙版"微博"跟人类打招呼

发布时间: 2012-03-26 16:34   来源:
关键词:

不久前,美国天体物理学家表示,地外文明搜索研究所(SETI)一直以来探索宇宙外星文明信号的方法可能并不正确。

The SETI Institute, listening to the cosmos for signs of signals from alien civilizations, may be monitoring the wrong “channels,” a U.S. astrophysicist says.

美国加州大学尔湾分校的(科学家)格雷戈里·本福德近日称,试图跟人类建立联系的外星人很可能力求节约资源,只发送较短的定向信息,而不是漫无方向地持续发送信息。而SETI一直以来搜索的信息正是后者。

Gregory Benford of the University of California, Irvine, says such a civilization wanting to announce it presence would transmit “cost-optimized” narrowly focused signals, not the continuous omni-directional signals the SETI program has been scanning for, a university release said recently.

“这种方法更像是推特(Twitter),而大部头的《战争与和平》,”格雷戈里·本福德的孪生兄弟,物理学家詹姆斯·本福德说。

“This approach is more like Twitter and less like War and Peace, ” James Benford, Gregory Benford‘s twin and fellow physicist, says.

“不论是何种生命形式,进化都使他们选择资源节约的做法。穿越光年发送信息,要花费相当巨大的资源。”

“Whatever the life form, evolution selects for economy of resources. Transmitting signals across light years would require considerable resources.”

这对兄弟说,外星人不会全方位的向外空间传送信号,而只是在1-10千兆赫的波段内定向发送。 但SETI采取的是大范围的信号扫描方式,这样一来,在外星文明发出“我们在这儿吶!”信息时,可能就已经错过SETI的扫描了。电动卷帘门

They says alien signals would not be blasted out in all directions but narrowly directed in the one-to-10 gigahertz broadband signal range and SETI’s broad sweeping search could leave many days when brief Twitter-like flashes of “here we are” from alien civilisations go undetected.

越来越多的科学家认为,这种简短、定向的信息(被称为本福德信号)才应该是SETI搜索的目标。

Such short, targeted blips, dubbed Benford beacons, should be the targets of SETI efforts, a growing number of scientists say.

本福德兄弟还建议科学家将搜索地点集中在银河系,特别是90%恒星所在的中心地区。

And the Benfords also suggest concentrating the search on our own Milky Way galaxy, especially its center where 90 percent of its stars are located.

“那里的恒星比太阳更早10亿年,”格雷戈里·本福德说,“这意味着那里更有可能存在着高等智慧生命。这比将SETI的天线对准银河系边缘更年轻恒星、也更稀疏的区域要好得多了。”电动卷帘门

“The stars there are a billion years older than our sun,” Gregory Benford says, “which suggests a greater possibility of contact with an advanced civilization than does pointing SETI receivers outward to the newer and less crowded edge of our galaxy.”



  


相关文章
没有相关信息



院长信箱: yzxx@beiwaionline.com      合作信箱: hezuo@beiwaionline.com

Produced By CMS 网站群内容管理系统 publishdate:2024/01/08 10:07:25