By Danny, Tiffany, and Connor. A “star” is a massive, luminous ball of plasma held together by gravity. A star forms as a collapsing cloud of material.
Observing Star-Formation From the Interstellar Medium to Star-Forming Cores On-Line Version, 1999 Alyssa A. Goodman Harvard University Department of Astronomy.
Stellar Evolution of Sun- Like Stars Star Birth Main Sequence Star Death Ohio University - Lancaster Campus slide 1 of 79 Spring 2009 PSC 100.
Star Birth AST 112 Lecture 9. Star Birth The Milky Way has 200-400 billion stars. 2-3 stars born per year in our galaxy!
The Milky Way and Other Galaxies Science A-36 12/4/2007.
