Life cycle of stars
the first stage in every stars life.
Nebula
is the power generated by nuclear fusion processes
Fusion Power
a substance that cannot be broken down into other substances by ordinary chemical means
Element
Where do stars form?
in the dark molecular clouds of dusty gas in interstellar space
the earliest period of the Mesozoic Era, lasting from 248 million years ago until 205 million years ago
Triassic Period
Exerts such a gravitational pull that no light can escape
Black Hole
is the mechanical energy required to disassemble a whole into separate parts
Binding energy
an atom with an electrical charge, either positive or negative
ion
High mass stars are born _____.
quickly
the second of the three periods that make up the Mesozoic Era lasting from 205 mya until 140 mya
Jurassic Period
the third stage in every stars life, the star is in it's middle age, around 6 billion years old. 90% opf a star's life is in this stage.
Main sequence star
Fusion occurs with mases less than iron
Releases Energy
a solid element or compound whose atoms are arranged in a regular, periodically repeated pattern
crystal
Why must molecular clouds be cold to form stars?
The cloud must be so cold that self gravity can overcome the pressure
a volcanic arc terrane accreted to North America during the Sonoma orogeny at the end of the Permian and beginning of the Triassic periods
Sonomia
the seventh stage of a low mass star, the gases have stopped glowing and all that remains is a dark piece of space rock, our sun will end its life like this.
Black dwarf
is the process that powers active stars, the hydrogen bomb and experimental devices examining fusion power for electrical generation.
Fusion
minerals whose chemical elements include carbon and oxygen as a major part of their chemical composition; an example is calcite
carbonates
contraction slows down and the center of a cloud fragment becomes:
a prostar
sedimentary rocks underlying the Great Valley of California that were deposited during the Jurassic and Cretaceous periods in the forearc basin that formed seaward of the Sierra Nevada magmatic arc
Great Valley Group
the other way a high mass star can end up as is a neutron star. This is a star so dense that one table spoon would weigh as mush as 10 suns! they spin so fast and move like black holes, but we can see them. But there is no way we could defend our selves from a neutron star or a black hole, if they were to crash into us we would be dead.
Neutron star
is the branch of astronomy that deals with the physics of the universe, including the physical properties of celestial objects, as well as their interactions and behavior
Astrophysics
The two most abundant elements in Earth's crust are ____.
oxygen and silicon
What percent of molecular cloud mass is dust?
1%
an interval of intensified igneous activity during the late Jurassic to Early Cretaceous caused by subduction of the Farallon plate beneath North America, resulting in the formation of the major igneous batholiths of the West
Nevadan orogeny