Flashcards in Oceanography before the earth chapter 1 Deck (15)
about 13.7 billion years ago, a plethora of stars and galaxies emerged that hosted planets and possibly the ingredients necessary for life itself.
gas or dust that may either be dark or may glow. Most of the gas we see in the universe is hydrogen gas. When illuminated by nearby stars a nebula will glow.
a collection of stars and nebula that clustered around a center of mass of very dense material. Many believe that the center of most galaxies might consist of a supermassive black hole (the collapsed remnant of a massive star from which no light can escape due to the strength of its gravitational field).
massive bodies of incandescent gases like hydrogen and helium that form from the condensation of a nebula
a nuclear reaction that produces so much energy that it pushes stellar material outward
a force due to the presence of a mass that pulls the mass of the star inward
is the fourth state of matter and can be described as a hot gas-like mass of ions that can be influenced by electromagnetic fields. It is the most common state of matter in the universe.
This phase of star formation lasts about 1 million years for a star the size of our Sun.
Once gravity and fusion are balanced and the core temperature reaches 10 million degrees, the star is considered a stable main-sequence star
As the density of the larger masses increased, they melted and fused in a process called annealing.
the size of the star expands into the red giant
The star will collapse into a very massive object (a white dwarf (defined below), in the case of our Sun)
The collapse by gravity results in a blast shedding outer gases called a planetary nebula
The collapse by gravity results in a supernova blast