Intermediate · 5 lessons
Stars and Stellar Evolution
Follow matter from cold clouds through fusion, stellar evolution and compact remnants.
- 1
How Stars Form
A star begins as part of a cold cloud, but becoming a stable star requires gravity, cooling, angular momentum and ultimately nuclear fusion.
About 2 minutes reading · Intermediate - 2
The Main Sequence
The main sequence is a stage of stellar life defined by core hydrogen fusion, not a line of stars physically arranged in space.
About 2 minutes reading · Intermediate - 3
Red Giants and White Dwarfs
A star can grow enormously while its core contracts. Separating the core from the envelope makes this apparently contradictory behavior understandable.
About 2 minutes reading · Intermediate - 4
Supernovae and Neutron Stars
A supernova is an explosion, but more than one physical route can produce it. The remnant depends on the progenitor and the mechanism.
About 2 minutes reading · Intermediate - 5
Black Holes and Stellar Remnants
A black hole is defined by an event horizon, a boundary beyond which outward signals cannot reach distant observers.
About 2 minutes reading · Intermediate
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