Sarah T. Stewart: Where did the Moon come from? A new theory
莎菈 T. 史都華: 月球是從哪裡來的?一個新理論
Sarah T. Stewart specializes in the study of collisions in the solar system. Full bio
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led to a discovery
後續導致了一個發現,
we think about the Earth and Moon.
地球和月球的看法。
is smash planets together.
把行星撞在一起。
using cannons like this one.
像這樣的大砲對岩石開火。
the extreme conditions
I can collide whole planets together
讓行星整個相撞,
how to make the Earth and the Moon
製造出地球和月球,
from other planets.
和其他行星如此不同。
of the Earth and Moon
如何形成的主要想法是
struck the young Earth,
撞擊了年輕的地球,
the debris disc around the planet.
碎片殘駭所形成。
so many things about the Moon,
from the Mars-sized planet,
是那個火星大小的行星,
are made from different materials.
不同的材料生成的。
are actually like identical twins.
in the isotopes of the elements.
元素的同位素中。
have identical isotopes.
are made from the same materials.
是用同樣的材料生成的。
and the Moon are twins.
這是很奇怪的事。
from different materials,
不同的材料生成的,
have the same genetic relationship.
有相同的基因關係。
on the origin of the Moon,
reject the whole idea of the giant impact.
整個大碰撞說。
to explain the special relationship
there weren't any better ideas.
had even bigger flaws.
the giant impact theory.
that we try changing the spin
年輕的科學家建議,
大碰撞說的自轉。
could mix more material
就能混合更多材料,
已經被選定,
that part of the model.
the length of Earth's day?
是由其他因素決定的呢?
giant impacts that could make the Moon.
都有可能形成月球。
faster-spinning giant impacts,
自轉更快速的大碰撞,
mixture of materials as the planet.
來生成一個盤。
to explain the Moon.
that that's just not very likely.
這實在不太可能發生。
is different from the planet,
都和這個星球不同,
making our Moon this way
生成我們的月球,
for everyone to accept the idea
to Earth was an accident.
was still in trouble,
how to make the Moon.
月球是怎麼生成的。
when I realized my mistake.
from these fast-spinning giant impacts.
快速自轉大碰撞的資料。
thinking about the Moon,
並沒有在想月球的問題,
and partially vaporized
那個星球變得超級熱,
connected to the disc.
might be something really interesting.
可能會有很有趣的發現。
with a separate disc around it.
它周圍有一個分開的盤。
was how we tested
生成月球的方式,
going to look like a planet.
一定會是行星的樣子。
was making something completely new.
in front of me
to try and figure it out.
with the unknown?
a planet anymore?
of our old way of thinking,
throw away all of the data,
丟掉所有的資料、
無法無天的想法,
into the real world to test them,
帶回真實世界做測試,
with computer models
和電腦模型結合,
after most giant impacts,
that gets denser and denser with depth.
越深的地方密度越高。
to figure out what was really going on
of astronomical object.
its rounded shape.
until it reaches a tipping point.
直到達到臨界點。
spreads into a disc.
of being a planet.
所有身為行星的規則。
as it gets bigger and bigger;
它的形狀不斷改變;
Hestia 的名字,
變成了這樣的角色。
強調所有材料之間的連結。
between all of the material.
推過了圓球形的極限時,
of a spheroidal shape.
of one of my simulations,
是我的其中一項模擬,
quickly from a previous giant impact.
先前的大碰撞而在快速自轉,
可以認出這是我們的星球,
would be recognizable
vaporizes the surface,
in just a few hours.
就把所有的氣體混合在一起。
giant impacts make synestias,
會產生索內斯蒂亞,
don't live very long.
沒有很長的生命。
and turn back into planets.
like Earth were growing,
one or more times.
轉變為索內斯蒂亞。
the problem of the origin of the Moon.
可以解決月球起源的問題。
inside a huge, vaporous synestia.
蒸汽的索內斯蒂亞中形成的。
inside the Earth
inside the synestia for years,
內部運行了很多年,
cooling and shrinking
內部冷卻並縮小時,
數百年的冷卻之後,
for hundreds of years longer.
into two new bodies,
分開成了兩個新天體,
identical Earth and Moon.
且讓它們擁有相同的同位素。
throughout the universe.
索內斯蒂亞被創造出來。
by finding them in our imagination:
我們在我們的想像中找到它們:
in the world around me?
我還遺漏了什麼?
by my own assumptions?
給遮蔽了,讓我無法看見?
something truly amazing.
ABOUT THE SPEAKER
Sarah T. Stewart - Planetary scientistSarah T. Stewart specializes in the study of collisions in the solar system.
Why you should listen
Sarah T. Stewart has been a Professor in the Department of Earth and Planetary Sciences at UC Davis since 2014, following 11 years as a Professor at Harvard University. A planetary scientist and MacArthur Fellow, she specializes in the study of collisions in the solar system and directs the Shock Compression Laboratory, which uses light gas guns to study shock waves in planetary materials. Stewart is best known for proposing a new model for the origin of the Moon, and she is dedicated to public outreach in the planetary sciences.
Sarah T. Stewart | Speaker | TED.com