It would explode. NOTHING is "billions of degrees hot"; at temperatures of "only" a few hundred million degrees, the very atoms themselves would disintegrate into pure energy.
If there was no gravity, the Sun and and the planets would never have formed.
the planets would have dashed each other
This question would not exist!
Spaceflight technology is not yet at a level that it would be possible to travel to Neptune. For this reason it is hard to say how much it would cost.
because we are one of the only planets with life.there are over billions of planets if there were another planet with life onit would you want to go there
Absolutely nothing
i do not this answer that's why i am asking you this answer.
The effect on earth would be no seasons
The planets would slowly start to randomly go in directions, eventually colliding into the sun, or other planets.
since there are billions of Galaxy's and planets we don't know about, i would be surprised if there wasn't intelligent life on at least some of them.
The force of gravity acts between any pair of masses, and especially between very big masses like the Sun and planets. The planets would all fly off in straight lines if the force of gravity was not there binding them to the Sun all the time, from billions of years in the past to billions of years in the future.
The object would crash into the planet.