When our Sun dies, and there is no gravity for our solar system, what will happen to all the planets and moons

Answer 1

It won't really matter as the sun will become a red giant just before it dies, enveloping most if not all the inner planets. When it does actually die it will go nova, blowing off most of its outer layers. This will most likely destroy all the inner planets that survived the red giant phase and eject the outer planets from our solar system (if it doesn't destroy them as well).

Life on Earth can in no way survive this. After all this has finished our sun will most likely become what is known as a white dwarf and will have about half it's current mass. Gravity will still exist but at half its current force. Any planets that stayed in orbit during the violence of our sun's nova would probably slowly increase its orbit until it just wanders off into space.

I wouldn't worry about this too much as we've got abut 4 billion years to wait, give or take a couple million years.

Answer 2

Our Sun is a yellow dwarf and when it dies it will still have gravity and lots of it! Because our star is not overly massive as far as Suns go, it will swell to 6 -10 times its present diameter during its death throes and swallow the inner planets and end up collapsing into a white dwarf, that is super dense with LOTS of gravity. It will not go supernova as some have suggested because its mass isn't big enough. This process will take around 10 thousand years and will not begin for around 5 billion years. To answer your question, all life on Earth would be gone around a million years before the death of our Sun because of massive changes in climate and solar radiatioin. The Gas giants will probably survive this catyclismic event but will be doomed to orbit the dead center of our Solar System forever in a cold dark nether world. The Earth, Mercury, Venus and most likely Mars would be vapourised by the expanding dying Sun. I wouldn't worry too much as we as a species would be long gone and extinct long before all this happens. Jules, lecturer. Australia.

Answer 3

If the sun burns out into a husk it will still carry weight and gravity but a fraction of what it had before, and will probably compete with planets like Jupiter to create a loose collection of floating bodies in space in slow orbit, atmospheres will freeze and fall and the planets will be frozen bodies, everything would be pulled back and forth between the largest bodies, planets, large asteroids, the forces could cause everything to just fragment into small groups and drift apart.

If the sun explodes (not the most likely solution) everything will be forced outward at high speed and probably broken down into morebase elemetns, dust and gas and could go to forming new planets or stars. In the event of a black hole (also unlikely) everything in the solar system could well be beyond the event horizon and would be pulled in and crushed.

Answer 4

The Sun is not massive enough to go Supernova. When the Sun has used up all its hydrogen fuel [which it is doing now at the approx rate of 600 million tons of hydrogen being fused into helium every second], it will evolve into a red giant. The surface will then lie somewhere just inside the orbit of Mars. As the surface expands from the yellow stage it will vaporize Mercury, Venus and Earth along the way. When it has used up all the helium, some of its mass will be ejected into space vaporizing the rest of the planets along the way into the Milky Way. The Sun will end up as a (relatively) "cool" white dwarf.

Answer 5

First of all if and when the sun "dies" there will be no solar system. Our sun is a star. When a star "dies" what happens is what is referred to as a supernova wich is a massive explosion caused by the sun using up all its"fuel" so to speak. The explosion is so powerful that we wont have to worry about orbits or gravity because It will wipe us out along with it. Comperically speaking though our sun is a fairly young star, probobly in its early teens, so you wont have to worry about this happening for quite some time.

Answer 6

Death of sun implies end of fission reactions deep in the sun when hydrogen atoms combine to become helium releasing energy the cause of heat and consequent light that we receive. Gravity depends directly on mass inversely on square of distance. Hence gravity will still exist. Since there are no reactions and no gaseous pressure gravity will cause it to collapse in to a dwarf. Since there is no heat radiation temperatures in solar system will fall much deeper below absolute zero. Since there is no light plants will stop photo- synthesis and there would be no oxygen, no carbon dioxide. Thus this cycle will break down resulting in the death of plants human and animal life. Temperatures will drop and oceans would freeze causing death of marine life. Earth would thus turn into a dark cold and dead planet. Similar scenarios would prevail on other planets and the moons.

Answer 7

It's a mute point. Part of the sun's death will involve it becoming a Supernova, which will disintegrate all other planets and moons.


BTW, dont lose any sleep over it. You and probably the whole human race will have been long since extinct before that ever happens.

Answer 8

When sun dies it depends on the mass of the sun if sun goes to black hole, every planet is pulled by gravitational force of black hole. If sun will reach the stage of supernova explosion side by side gravitational pull of sun will become weak which force the planets to move away from sun.

Answer 9

Before that the Sun would turn into a red giant and burn all the inner planets.

Answer 10

If the sun were to instantly vanish, the planets would continue on a path tangent to the orbit they were in at the time.