初級 32 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
[ MUSIC ]
Eye on Neptune – presented by Science@NASA
It is an ice giant, a planet of monster storms, and a recluse rarely seen.
However on the night of September 9 the planet Neptune will be at opposition,
the yearly event where Earth passes directly between Neptune and our Sun.
Sky watchers and astronomers will take the opportunity to observe this planet
that is invisible to the naked eye, but that scientists would love to see more clearly.
When it is near opposition, Neptune reaches its highest point in the sky around midnight.
This makes evenings in September the best time to grab your telescope or high-powered binoculars,
and use a sky chart or sky watching software to view this planet
that is 30 times farther from the Sun than Earth.
When you find this elusive planet that appears as a mere dot in most amateur telescopes,
remember that you're actually viewing a planet with a thick atmosphere
that is composed of massive amounts of hydrogen and helium with traces of other gasses.
That atmosphere surrounds a solid interior of rock and a warm mantle of dense fluid, deep beneath the clouds.
This opposition event also comes just after the 30th anniversary
of the Voyager 2 spacecraft's flyby of the planet, in 1989.
Voyager 2 provided our closest glimpse of Neptune, passing about 3,000 miles (5000 kilometers) above its North Pole.
The pictures Voyager 2 sent back gave scientists a new snapshot of weather in the extreme,
including a dark and violent vortex that looked similar to the great red spot on Jupiter.
Since then, observatories such as the Hubble Space Telescope
have given us additional observations of the planet from afar.
NASA scientists have learned, for instance, that unlike Jupiter,
the Neptune vortex disappears for a time, and then similar storms appear later.
Scientists have determined that Neptune has seasons such as those on Earth,
but that these are much longer, spanning decades instead of months.
By studying these seasons on a continual basis,
scientists look to gain a better understanding of the similarities and differences
of atmospheres on other planets, including right here on Earth.
So consider taking a look at the ice giant planet Neptune in September,
and you'll see why it captures the imagination of so many scientists and astronomers.
Grab your telescope, step outside, and enjoy the view.
For more details on Neptune and the other planets in our solar system, visit science.nasa.gov.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

NASA ScienceCasts: Eye on Neptune

32 分類 收藏
林宜悉 發佈於 2019 年 10 月 10 日
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔