Name: 【TED-Ed】The death of the universe - Renée Hlozek
Uploaded: 2014-11-30T13:04:25.000Z
Duration: 4 min 40 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

we are amazed by how it seems to go on forever.

spends her time thinking about that very question.

The end of the universe is intimately linked

Einstein developed the Theory of General Relativity,

We call this positively curved or closed.

We now know that the universe is very close to flat.

if we measure the amounts or energy densities

of the various components in the universe today.

The universe contains all the things that we can see,

We call these things ordinary or baryonic matter.

the total energy density of these components

around 5% of the total energy of the universe.

So, now let's talk about what the other 95% is.

Dark matter is only very weakly interacting with light,

which means it doesn't shine or reflect light

In fact, the only way we can detect this dark matter

is through this gravitational interaction,

We have yet to discover a dark matter particle,

but scientists all over the world are searching

and the effects of dark matter on the universe.

which is even more mysterious than dark matter.

We say that it has a gravitational pressure,

which ordinary matter and dark matter do not.

Instead of pulling the universe together,

the universe appears to be expanding apart

that it expands as the volume of space increases

the future universe will be more and more dominated

Eventually, the universe will run out of gas

and the stars themselves will run out of fuel

leaving the universe with only black holes in it.

leaving a universe that is completely cold and empty.

That is what we call the heat death of the universe.

Subtitles ListPlay Video

【TED-Ed】The death of the universe - Renée Hlozek

matter

constant

leave

universe