The video owner has disabled playback on external websites.
This video is no longer available on YouTube.
This video cannot be played right now.
Watch on YouTube
ابزارهای یادگیری هوش مصنوعی را باز کنید
ثبتنام کنید تا به ابزارهای قدرتمندی دسترسی پیدا کنید که به شما کمک میکنند سریعتر از هر ویدیو یاد بگیرید.
Black Holes Explained – From Birth to Death
آمار یادگیری
سطح CEFR
سختی
زیرنویسها (131 بخشها)
Black holes are one of the strangest things in existence.
They don't seem to make any sense at all.
Where do they come from...
...and what happens if you fall into one?
Stars are incredibly massive collections of mostly hydrogen atoms
that collapsed from enormous gas cloud under their own gravity.
In their core, nuclear fusion crushes hydrogen atoms into helium
releasing a tremendous amount of energy
This energy, in the form of radiation,
pushes against gravity,
maintaining a delicate balance between the two forces.
As long as there is fusion in the core,
a star remains stable enough.
But for stars with way more mass then our own sun
the heat and pressure at the core allow them to fuse heavier elements
until they reach iron.
Unlike all the elements that went before,
the fusion process that creates iron
doesn't generate any energy.
Iron builds up at the center of the star
until it reaches a critical amount
and the balance between radiation and gravity is suddenly broken.
The core collapses.
Within a fraction of a second,
the star implodes.
Moving at about the quarter of the speed of light,
feeding even more mass into the core.
زیرنویس کامل در پخشکننده ویدیو موجود است
با تمرینها یاد بگیرید
تمرینهای واژگان، گرامر و درک مطلب از این ویدیو بسازید
نظرات (0)
برای نظر دادن وارد شویدثبتنام کن و همه امکانات رو باز کن
پیشرفتت رو دنبال کن، واژگان رو ذخیره کن و تمرین کن
حالت تعاملی
آزمون
پاسخ صحیح:
ویدیوهای مرتبط
Patrick Bateman being himself for about 12 minutes
The Start of WW1 | Frightful First World War | Horrible Histories
Syria's war: Who is fighting and why
Kit Harington Answers the Web's Most Searched Questions | WIRED
We Go Together (From "Mufasa: The Lion King") (Official Video)
Kurzgesagt
آزمون
پاسخ صحیح:
آزمونها هنگام تماشای ویدیو ظاهر میشوند
راهنمای حفظ
از این ویدیو
شروع رایگان یادگیری زبان
