Life Cycle of Stars | GCSE Physics | Doodle Science

Doodle Science teaches you high school physics in a less boring way in almost no time!

GCSE Science

Script:
Stars initially form from clouds of dust and gas. The force of gravity makes the gas and dust spiral in together to form a protostar.

As the gas and dust falls together, it gets hot. A star forms when it is hot enough to fuse hydrogen nuclei into to helium.

The star then immediately enters a long stable period, where the heat created by the nuclear fusion provides an outward pressure to counteract the force of gravity pulling everything inwards. In this stable period it’s called a main sequence star and it lasts several billion years. Luckily for us our sun in about half way through it’s stable period.

Eventually however, like everything, the star must die. It takes one of 2 courses, the boring way or the cool way.

Stars that are about the same size as our sun tend to take the boring way out. When the hydrogen begins to run out they begin to fuse heavier elements all the way up to iron in its core. The star at this point swells into a red giant which is unstable and ejects it’s outer layer of dust and gas as a planetary nebula; leaving behind a hot dense solid core called a white dwarf.

Told you it was boring. Stars much bigger than our sun such as Betelgeuse are big enough to take the much more interesting route. Once they run out of hydrogen they start to swell up too, into a red super giant. At this point they are making elements in their core up to iron but it’s when they explode in a supernova, that the heavier elements are formed that are found all over our planet.

The exploding supernova throws out its outer layers of dust and gas into space leaving a very dense core called a neutron star or in some cases a black hole.

So if stars are responsible for nearly all of the elements on the periodic table, I guess you could say this video was brought to you by stars.

[daisyfry]

I actually love him. He's so amazing and is actually good at teaching and making it seem interesting.

[phoebekaty]

the only useful video on stars i've found, thanks!

[rajaritonga]

Not too fast yet not too slow. I love it!

[georgiawallhead]

I can't explain how helpful this was !!! It's was short enough so I didn't get bored and thanks for including the script

[sharleenollivier]

omg Thank you so so much for this, I've never understood the cycle of stars and my physics exam is in about an hour so you've been a great help! whooo!

[shannonofficial]

Thank you! Using your channel for my physics gcse tomorrow! Hopefully I get a C

[youtubeaccountx]

Only thing about this video is that it’s a bit too quick i notice I always had to play back the video

[kitkatblogger]

This was really useful short and educating. Thank you.

[dnangel]

Our sun is not big enough to fuse iron, am i correct?

[undeadkoala]

I love you guys. I watch your videos all the time. If only there was a chemistry and biology version of you. Keep up the good work!

[eleanorluxton]

Amazing - you make it sound so easy and interesting! Really helped me revise - thanks so much!

[oliviarandom]

These videos are super helpful - thanks!

[whipdic]

Oi mate thanks a lot! This vid helped me explain something my teacher couldn't in 3 lessons

[Qurske]

If our sun and other stars like it die and turn into nebula which is dust and gas if under enough pressure does it become a star again?

[alwaystired]

So helpful and very condensed, thanks :)

[randompersonasdf]

Thank you for posting this video, helped me with my homework.

[gemmabooton]

Does this need to be known for p2 or is it only for p1?

[olivialamb]

Thanks this helps me so much got my science exams soon😵

[hdutton]

Questions involving stars are generally 6 markers, however I don't see 6 points/stages

[craig]

i never understood why people dislike videos about GCSE science, i now know why.