Main Point
Tiffany Kim's List: Science 8 Astronomy
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Main-Sequence Lifespan
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protostars
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dies away as a brown dwarf
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Interstellar Medium (ISM
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Emission Nebulae
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nebula
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"circumstellar
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Circumstellar discs are a natural step in the evolution of stars. Stars begin life as dense cocoons of gas and dust, then as pressure and gravity kick in, they begin to coalesce, and a flat ring of gas and dust takes shape around them. As stars continue to age, they suck material from this disc into their core. Eventually, a state of equilibrium is reached, leaving a more mature star encircled by a stable disc of debris.
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Current theory holds that planets are made from disks of gas and dust left over after star birth.
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attention to interactions with gas and dust and not enough attention to interactions between planets.
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born in the small town of Marshfield, Missouri, USA, on November 29th, 1889.
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Chicago
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stubborn, ambitious, sometimes even snobbish and arrogant young man
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passed the bar
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Q: What is the exact wording of the official IAU proposed definition of “planet”?
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Q: Why is Pluto now called a dwarf planet?
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mass that the temperatures and pressures at its core are hot enough to ignite fusion
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Most planets are actually made of similar material to the Sun. Both Jupiter and Saturn have similar mixtures of hydrogen and helium. If the planet Jupiter is made of hydrogen, why doesn’t it shine like a star? It all comes down to mass. Jupiter would need to be about 80 times more massive before it had enough mass to actually ignite hydrogen fusion at its core.
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Specifically, gravitational forces are responsible for the rise and fall of the ocean's tides all over the world
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much more strongly than the star
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