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- Everything physical that exists in space and time ~ all matter and engery that ever has or will exist
Why do we use a different measurement system for the universe than on Earth?
the distance of the universe is so huge
Give 2 examples of Irregular Galaxies
the Large Magellanic Cloud and the neighboring Small Magellanic Cloud
creates new stars at a very high rate (a type of Active Galaxy) ~ 100 new stars per year
How is a black hole created?
the outside of a dying star is pulled to the center of the star toward the pull of gravity
Why can stars emit light?
at the center of most stars hydrogen is being converted into helium through a pressure called nuclear fusion, this creates a huge amount of energy
Why is the energy from the nuclear fusion reactions created ?
both protons have overcome the Electromagnetic Force and the Weak and Strong Force take over
What will the sun become when it runs out of hydrogen? ~ What part of the sun expands at this point?
a Red Giant ~ the outer layer
Past what point do Astronimers think that the sun will expand when it reaches this point?
past the Earth's orbit
- The carbon oxygen core is still hot but not enough to produce heaver element the remaining core is the white dwarf
Stars that are 1.4 times larger than our sun and Huge stars and giant stars are formed from them
- Like medium stars the core of these large stars become carbon and oxygen but the size of these stars because they are so big allow nuclear fusion reactions until iron is formed ~ The forces that usually keep a star in balance or intact causes it to explode
What determines whether a star becomes a black hole or a neutron star? What kind of star becomes what?
It's size ~ huge star becomes a neutron star ~ a giant star becomes a black hole
What is the theory of the creation of our sun?
formed out of an interstellar cloud (between stars)
The core of the Sun
- Contains hydrogen and helium atoms, the temps and pressure are so great that it creates thermonuclear fusion
Heat continues to be transferred to the outer layer of the sun but it is transferred by convection
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