CK-12 Foundation
Ck 12: Earth Science: Star Classification
[Free Registration/Login may be required to access all resource tools.] How a star is classified according to color and temperature.
CK-12 Foundation
Ck 12: Earth Science: Main Sequence Star Lives
[Free Registration/Login may be required to access all resource tools.] Examines the main sequence of the star's life cycle.
BBC
Bbc: Gcse Bitesize: The Life Cycle of a Star
This lesson focuses on the formation and life cycle of stars. Stars form when enough dust and gas clump together because of gravitational forces. Nuclear reactions release energy to keep the star hot. Some stars grow larger over time....