How do we know how long the Sun has left to live? | 7 things we need to know
You'll often hear people say that the Sun has about 5 billion years left to live before it runs out of fuel. But where does that number come from? It's quite a simple back of the envelope calculation but there are 7 key things we need to know before we can do that...
For more on why E=mc2 see this article from Ethan Seigel: https://www.forbes.com/sites/startswithabang/2016/05/27/why-does-emc2/
To find out more on helioseismology and how we "listen to the Sun" check out this lecture: https://www.youtube.com/watch?v=wqwGljLDcjM
02:08 - the calculation of the lifetime of the Sun
05:23 - how we know the mass of the Sun
07:54 - how we know the distance between the Earth and the Sun
08:39 - how we measure the brightness of the Sun
09:44 - why E=mc2
11:04 - how we know the Sun is powered by nuclear fusion
13:35 - how we measured the mass difference between 4 Hydrogen atoms and 1 Helium atom
16:58 - how we know the core of the Sun is where nuclear fusion takes place (helioseismology)
19:02 - how we know how old the Solar System (and therefore the Sun) is
-----
You can pre-order my book ' Space: 10 Things You Should Know' as a hardback (UK only) or e-book (worldwide): http://bit.ly/SpaceDrBecky
-----------
Follow me on Twitter: https://twitter.com/drbecky_
And on Instagram: https://www.instagram.com/drbecky_s/
Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
------
Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
http://drbecky.uk.com
Видео How do we know how long the Sun has left to live? | 7 things we need to know канала Dr. Becky
For more on why E=mc2 see this article from Ethan Seigel: https://www.forbes.com/sites/startswithabang/2016/05/27/why-does-emc2/
To find out more on helioseismology and how we "listen to the Sun" check out this lecture: https://www.youtube.com/watch?v=wqwGljLDcjM
02:08 - the calculation of the lifetime of the Sun
05:23 - how we know the mass of the Sun
07:54 - how we know the distance between the Earth and the Sun
08:39 - how we measure the brightness of the Sun
09:44 - why E=mc2
11:04 - how we know the Sun is powered by nuclear fusion
13:35 - how we measured the mass difference between 4 Hydrogen atoms and 1 Helium atom
16:58 - how we know the core of the Sun is where nuclear fusion takes place (helioseismology)
19:02 - how we know how old the Solar System (and therefore the Sun) is
-----
You can pre-order my book ' Space: 10 Things You Should Know' as a hardback (UK only) or e-book (worldwide): http://bit.ly/SpaceDrBecky
-----------
Follow me on Twitter: https://twitter.com/drbecky_
And on Instagram: https://www.instagram.com/drbecky_s/
Don't forget to subscribe and click the little bell icon to be notified when I post a new video!
------
Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
http://drbecky.uk.com
Видео How do we know how long the Sun has left to live? | 7 things we need to know канала Dr. Becky
Показать
Комментарии отсутствуют
Информация о видео
Другие видео канала
Galaxies can die?! | Quenching 101How do we know how heavy the Earth is? | 3 things we need to knowWhy does stuff have mass? | The history of the Higgs BosonHow I became an Astrophysicist | 2004-2020Why the Earth exists because of Saturn | Migration of PlanetsAstrophysicist Debunks Horoscopes with Basic Astronomy (+ SPECIAL ANNOUNCEMENT!)How does Mercury's orbit prove General Relativity?Is light a wave or a particle? | Great debates in physicsDark matter: smooth or clumpy?! | The Dark Energy Survey Results!How did the Moon form? | 5 things we learnt from the Apollo Moon LandingsClosest black hole to Earth found & the mystery of Fast Radio Bursts solved? | Night Sky News May 20Was Einstein "wrong"? | Testing new theories of gravityI'm going to steal the Moon... (with a giant electromagnet)All the evidence we have for dark matter | A century's worth of science historyAstrophysicist reacts to funny space MEMESHow did Saturn's Hexagonal Polar Vortex form?! | Space is WeirdThe giant wave of gas discovered near the Sun in the Milky Way | The Radcliffe WaveWhere is the most habitable place in the Universe? | AstrobiologyHow did we measure the fastest speed there is? | The History of the Speed of Light Part I