分类目录归档：space
Transcriber: tom carter Reviewer: Bedirhan Cinar
Of all the spectacles mankind has viewed through a telescope,
there are few lovelier than a spiral galaxy.
Majestic whirlpools of stars, they rotate in
when I was a child growing up in Maine
one of my favorite things to do was to
look for sand dollars on the seashores
of Maine because my parents told me it
would bring me luck but you know these
shell
Translator: Andrea McDonough Reviewer: Jessica Ruby
There are still lots of things about space
that we may never be able to answer,
like is time travel possible?
Or are aliens living somewhere else in
Transcriber: Andrea McDonough Reviewer: Jessica Ruby
These are grizzly bears.
As you can see, they have big teeth and giant claws.
But once you get to know them better,
they're not as ferocious as you
Have you ever been floating in a swimming pool,
all comfy and warm, thinking,
"Man, it'd be cool to be an astronaut!
You could float out in outer space, look down at the Earth and everything.
It'd be
On October 4, 1957,
the world watched in awe and fear
as the Soviet Union launched Sputnik,
the world's first man-made satellite,
into space.
This little metal ball,
smaller than two feet in diameter,
Space: it's where things happen.
Time: it's when things happen.
We can measure where things are
and when things take place,
but in modern physics,
we realize when and where
are actually part of the sa
Light: it's the fastest thing in the universe,
but we can still measure its speed
if we slow down the animation,
we can analyze light's motion using
a space-time diagram,
which takes a flipbook of ani
Gravity. It controls the universe.
Everything attracts everything else.
Ouch!
Including you.
Ow!
In this final lesson,
we'll explore what gravity means for space-time,
or rather what space-time means
When you picture a spaceship, you probably think of something like this,
or this, or maybe this.
What do they all have in common?
Among other things, they're huge because they have to carry people, fu