elopez
Well-Known Member
That's not entirely true.A protostar has most of its stellar mass in place already.
To become a star a mass between 0.08 and 150 Msun is needed. If the mass of a protostar is less than 0.08 Msun it will become a brown dwarf. Some protostars have lower mass and become a red giant. Others have a higher mass and become supergiants. Our sun is in the main sequence phase, and in a billions years worth of time it will become 10% larger than it is now.
If the sun were even half it's mass as it is now, it would grow cooler and redder and eventually transform into a red dwarf. Because a red dwarf would give off less heat and light, it would have a smaller habitable zone. If a planet is located far beyond its star’s habitable zone, its water will be frozen.Of course, the orbit of a planet would shift during the formation of a star. So what? It won't destroy all the planets.
In the case of our Sun, the habitable zone is roughly 67.4 million miles from the solar surface, and stretches some 211.5 million miles outward. Red dwarfs have habitable zones that start 18.5 million miles in, and stretch a mere 9.3 million miles beyond. Given Earth’s current distance - 93 million miles from the sun - the enivroment and climate our of planet would change in such a dramatic way that it could not support life. All other planets would drift out of the solar system entirely, again as they are simply too massive to be retained by such a meager sun as you suggest.
Well this all depends on how and when you think the moon formed. I would guess you would say that the moon was created the same day as the sun. In that case, the rotation of the earth was slower, meaning days and nights would have been shorter. So if you're defining day also as 24 hours, this fact of slower earth rotation would really conflict with that definition.The duration of day/night should not be a concern (who cares?).
Earth would not revolve around the sun any more. Eventually we would see an endless night. I mean, there would eventually be no light.If the earth was flying away from the sun, would the day/night cycle time become longer and longer?
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