Black Hole project

Transcript

00:00

Hi everyone!

00:01

I hope you are doing well.!

00:04

Welcome to the ASTR 160 comedy club, and today we will be discussing an important topic – no not whether Hermione should have ended up with Harry.

00:05

A HOW TO "EDUCATIONAL" VIDEO

00:05

The ASTRO 160 COMEDY CLUB:        BLACK HOLE EDITION

00:18

We will be discussing how black holes form.

00:22

This should only take around 3 minutes – but remember as a spoke about last video, time is relative so I may go a little over…

00:35

I know what you are already thinking – black holes are not those things where your nieghbour’s lost cat goes, or where you say your homework went to your teacher when you haven’t done it.

00:53

to understand black holes, we have to go to the beginning, even before black holes are born.

01:01

Indeed, unlike Grandpa Joe, black holes were not around forever.

01:06

Okay so in the beginning, God created the heaven and the earth.

01:11

   ASTRO 160 COMEDY CLUB

01:12

Oops wrong script – that was for Bible 110.

01:17

This is ASTRO 160.

01:19

Now it begins with dust, something I know very well growing up in the UK where I spent my childhood chimney-sweeping.

01:30

The galaxy contains not only billions of stars – no, not those kinds of stars – but also large amount of gas and dust.

01:42

These regions of gas and dust in the galaxy lie in the space between the stars.

01:50

If the galaxy were a street, the houses would be stars and the regions of gas and dust would be the gardens in between the houses.

02:03

Any a lot of this gas accumulates to form clouds – called molecular clouds – because of their content.

02:13

Think cloudy with the chance of dust.

02:16

This dust moves around erratically in many directions, smashing into each other – like school children playing tag in a schoolyard.

02:27

When they bump into each they accumulate.

02:30

Some groups are large, some are small.

02:34

In fact, there is a ratio of big groups to small groups – though the ratio is not as big as the ratio of Elon Musk on Twitter.

02:48

Anyway, these clumps get so big that they turn into stars themselves.

02:54

We are concerned with the top 0.

02:58

5% of these stars – the Summa Cum Laude ones.

03:03

The stars that at their core are over 1.

03:08

4x MSun have the potential to become black holes.

03:12

That is because their core is so big that it will eventually implode due to its own gravity.

03:21

This is called the Chandrasakhar limit.

03:24

These biggest stars are large, blue, just like Uncle John on a cold day.

03:31

They also have short lifetimes, also like Uncle John.

03:36

Actually, they live around 10-100 million years – almost as long as one of Rabbi Cohen’s speeches on the Sabbath.

03:46

These blue stars eventually go supernova – which is a massive explosion - like when your Mum finds out you didn’t put the chicken in the oven for supper.

04:01

However, this lasts only two weeks, unlike your mum who will hold it against you for two years.

04:10

If the core mass is between 1.

04:14

4 < M < 3 Msun,

04:17

pressure from the nucleus itself will stop the

04:21

collapse => Neutron Star.

04:23

If the core mass is above 3 Msun, nothing

04:28

can stop the collapse => Black Hole!

04:31

And there you have it – how a stellar black hole is formed.!

04:38

Thank you so much for listening.

04:41

Please join us next time here at the ASTR 160 comedy club, where we will be discussing what to do with your ex, specifically exoplanets.

04:54

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