This is the Stellar Evolution Of a star in the Universe A Nebula is the beginning Of a star before its birth The star names you will encounter Are some basic different stages In the evolution of a star And all it's basic changes I'm a Molecular Cloud I'm a type of Nebula I have a high density And a very low temperature This combination creates the gas Molecular hydrogen That's primarily what I'm made of Along with cosmic dust within When the force of gravity Exceeds the outward push of the gas The pressure is so great that I Can't help it and start to collapse Which is caused by a Shockwave from a near exploding star Or when two molecular clouds collide Now isn't that bizarre When the gravity's too strong I break apart into smaller clouds Each cloud is a stars beginning In which I am very proud Protostars are the name Of all the clouds that do break free Let me introduce a Protostar That was a part of me Hello there I'm the beginning Of any kind of star Let me introduce myself to you I am a Protostar My core is not hot enough For fusion to occur To achieve that level of stardom This process is a chore The first thing I do when I brake free from my molecular cloud I start to spin until I form this disk Around me, you see now As the disk rotates I produce A strong magnetic field Pulling gas and dust into My center core as I reveal The Infalliing gas releases A kinetic energy Creating heat increasing the temperature In the center of me At this point, I can transform Into a hydrogen-burning star Which is when the nuclear fusion starts In a Protostar This is when I cross over To Stage 3 Called T Tauri We play our different roles In the star formation see This is the Stellar Evolution Of a star in the Universe A Nebula is the beginning Of a star before its birth The star names you will encounter Are some basic different stages In the evolution of a star And all it's basic changes I'm a T Tauri Star now Also a Pre Main Sequence Star My job's to clear away The dust and gas and send it really far My stellar winds create bipolar outflows That does decrease my mass Until I'm a main sequence star My center burning nuclear gas I'm a Main Sequence Star now Just like the sun, you know For billions of years, I will burn Throughout my light show Converting hydrogen to helium Is how fusion exists It wants to blow me apart But it has a hard time doing this Because of gravity of equal Power pushing me in I am able to stay burning Since the fusion did begin There are many different kinds of stars Throughout the universe Go learn about them all Now you know how they are birthed This is the Stellar Evolution Of a star in the Universe A Nebula is the beginning Of a star before its birth The star names you will encounter Are some basic different stages In the evolution of a star And all it's basic changes This is the Stellar Evolution Of a star in the Universe A Nebula is the beginning Of a star before its birth The star names you will encounter Are some basic different stages In the evolution of a star And all it's basic changes