字神帝國英語天地

今日主題：Dark Matter Shell Saved Wannabe Galaxy
暗物質保護了星系

洪欣老師推薦：托福聽力最好的課外教材：60-Second Science
康康精選托福會考的主題，堅持每天精聽一定會進步的哦!!

建議方法：
1. 先聽兩三遍 (不看文稿)
2. 再一句一句聽寫 (每句都要聽寫數遍，直到寫出85%以上的字)
3. 最後check文稿，看哪聽不出來，單字沒背過，還是發音不熟。
4. 堅持天天聽，就能每天進步哦。

MP3音檔 (按右鍵可下載聽)：喜歡的同學，幫忙推或按讚哦~~
http://online1.tingclass.net/voas…/2014/20140603sa_space.mp3

只有音檔怎夠，聽不懂地方，不用怕，康康幫你準備好中英文稿了：

中英文稿：
Dark matter is that mysterious stuff that apparently accounts for some quarter of the mass and energy in the universe.
暗物質是一種占宇宙構成近四分之一的神秘物質。

And for one small wannabe-galaxy, dark matter may have been a lifesaver.
對於自封的銀河系來說，暗物質就像是一名“救生員”。

It's called the Smith Cloud. Astronomers think it's a failed dwarf galaxy that lacked the requisite mass to produce stars.
這種星系又被命名為“史密斯雲”。天文學家認為它是不成器的矮星係，因缺乏必備的質量而不足以產生恆星。

Many millions of years ago the cloud seems to have collided with the Milky Way and passed through the disk of our galaxy.
幾百萬年以前，這種“史密斯雲”星係就曾與銀河係發生碰撞，並曾穿過了我們銀河系的銀盤。

A new computer simulation finds that the cloud should have been ripped to shreds. That it survived is evidence that it's protected—by a shell of dark matter.
一種新的電腦模擬系統發現這種“史密斯雲”星系本應該已經被撕成碎片。然而它能倖存下來就是有效說明暗物質在保護它的證據。

The report will appear in the journal Monthly Notices of the Royal Astronomical Society. [Matthew Nichols et al, The Smith Cloud and its dark matter halo: Survival of a Galactic disc passage]
本報導將發表在英國皇家天文學會的每月通告上。【馬修•尼科爾斯等，《史密斯雲和它的暗物質暈：銀盤的倖存篇》】
That dark matter shell could have insulated the Smith Cloud from the Milky Way's gravitational forces, which otherwise should have torn Smith apart.
這種暗物質層能夠使此星系免受銀河系萬有引力的影響，要不是暗物質的保護，“史密斯雲”星系早已經被銀河系的萬有引力撕成碎片。

As if its first fender-bender with the Milky Way wasn't enough, the Smith Cloud is coming back for more. It's on course to slam into our galaxy again—in about 30 million years. Perhaps future astronomers will note whether its dark matter shroud once again saves the cloud.
—Clara Moskowit
似乎“史密斯雲”認為第一次與銀河系的撞擊還不夠“刺激”，現在它又要再一次與銀河系“親密接觸”。按規律推算，在未來三千萬年內它還要與銀河系進行一次猛烈撞擊。也許未來的科學家可以確定是否暗物質會再一次拯救“史密斯雲”星系。
由Clara Moskowit報導。