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Originally Posted by marty2005 What will happen when our Sun goes super-nova and looses gravity? It's going to escape gravity and take our Earth with it.
What will happen to life then? |
Well, the Sun is a Main Sequence G2 star, and, as such, does not possess enough mass to go Supernova. It will instead expand to a Red Giant and eventually cool to a White Dwarf.
As far as the gravity question is concerned, the Sun is the main source of gravity locally. As it ejects mass both during and after the Red Giant phase, t will exert a weaker influence on the Earth, causing the Earth's orbit to drift "outwards". Some cosmologists have suggested that the rate of drift might negate the effects of the Sun's expansion thus leaving Earth as a habitable planet. More detailed studies which take into account the gravitational buffeting that the Earth would endure as the Sun expands suggest that this might not be the case. Personally, I'm glad I won't be around to find out.
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Originally Posted by Kazuya Mishima That's the idea which has my mind boggling. I mean, as far as I understand it, the atoms which constitute our bodies haven't come out of thin air, they came from somewhere, right? So what did the atoms in each of our bodies used to be part of? |
It depends how far back you want to go, I suppose. Many atoms on Earth get recycled between different people, between humans/plants etc., so to ask where all the atoms in a particular person came from would be pretty impossible.
You could argue that we are all made of "stardust", the remnants of supernovae explosions in the early Universe. These were the main furnaces wherein a lot of different materials were created. Of course, even before that we have the birth of the Universe itself. Now, if you could explain that and give a good reason for the matter-antimatter asymmetry, or the fact that time only flows in one direction, or solve any of a good number of other current theoretical problems, the physicists and cosmologists would be fallling over each other to get an audience.