Universe
What is the Univers?
types of univers
What is in the univers
Dark matter -a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity.
Big bang theory - It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now.
General theory of relativity
Stellar Evolution
Colors
100 billion galaxies
Closed universe
Open universe
Flat universe
Self-generated universes
Baby universes
Hottest stars are bluish-white
Coolest stars are orange, yellow and red
Massive stars
Supernova
Red supergiant - the star swells and heats up. Througt nuclear reaction, a heavy core of iron is formed
Star
Protostar - has a dense, geseuos core surrounded by a cloud of dust
Black hole - cosmic body of extremely intense gravity from which nothing, not even light, can escape.
Neutron star - rapidly spinning neutron star that gives off a beam of radio waves or other radiation.
Small star
Red giant- the star continues to expand, but its mass remains constant and its core heats ups.
Planetary nebula -is a region of cosmic gas and dust formed from the cast-off outer layers of a dying star.
Star
White dwarf the remains of the Red giant, in which the fusion of carbon and oxygen has ceased, lie at the center of the nebula.
Protostar
Black dwarf
95% of stars end their lives as a white dwarfs.
Galaxies
Spiral- a nucleus of old stars is surrounded by flat disk of stars and two or more spiral arms
Irregular - contains a large amount of gases and dust clouds
Elliptical - have little dust and gas. Their masses fall within a wide range
