Protostars

Protostars are Pre-main-sequence stars. They are powered by gravity and not fusion. These objects are what all stars do at their birth before planetary formation. Protostars are embryonic stars. They are stars before they are stars. This is part of my intro Astronomy class taught at Willam Paterson University and CUNY Hunter.

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0:00 Introduction
0:01 Star Clusters
2:28 Steps to Stardom...
3:01 Cloud Fragmentation
3:48 The Formation of Stars Like the Sun
11:02 Building a Protostar
12:30 A Quick Beginning...
13:28 Protostars have Disks
14:07 Clearing out the Disk
15:18 From Protostar to Star
16:48 Kelvin-Helmholz Timescale
21:39 High-Mass Protostars
22:23 Low-Mass Protostars
23:38 The Zero-Age Main Sequence
24:44 Minimum Mass is about 0.08 Solar Masses
25:54 Brown Dwarf Gliese 229B
28:19 What can we see?
29:46 Life Cycles of Stars
32:51 Baby Stars in the Trifid Nebula
38:14 A massive disk around a baby star....
39:14 Protostellar Jets
48:09 Protostars in the Orion Nebula
53:35 Fragmentation of protostars from a giant molecular cloud

Supplement the videos with "OpenStax Astronomy"
https://openstax.org/books/astronomy/...
20: Between the Stars: Gas and Dust in Space

https://openstax.org/books/astronomy/...
21: The Birth of Stars and the Discovery of Planets Outside the Solar System

https://en.wikipedia.org/wiki/Protostar
Protostars

https://en.wikipedia.org/wiki/T_Tauri...
T Tauri star

https://en.wikipedia.org/wiki/Pre-mai...
Pre-main-sequence star

https://en.wikipedia.org/wiki/Herbig_...
Herbig Ae/Be star

https://en.wikipedia.org/wiki/Herbig-...
Herbig-Haro object

https://en.wikipedia.org/wiki/Kelvin-...
Kelvin-Helmholtz mechanism

https://en.wikipedia.org/wiki/Gravita...
Gravitational collapse

https://en.wikipedia.org/wiki/Nebular...
Nebular hypothesis

https://en.wikipedia.org/wiki/Jeans_i...
Jeans instability