Kinda, sorta. All the planets in our solar system are in stable orbits and won't come near colliding with each other within foreseeable time. But space is a big place, and powerful events enough to knock a planet out of orbit can occur.
He may easily have seen all of the planets in our solar system at one time or another, but the only one he or anybody else ever walked on is the Earth.
Because if they were ever going to collide they would have done it at some time in the last 3.5 billion years. Each planet has its own stable orbit which takes it round the Sun regularly at a fixed range of distances that does not overlap with other planets. The planets are understood to follow Kepler's laws in elliptical orbits, under the force of the Sun's gravity.
Yes. Sometimes Neptune is father away from the sun than Pluto. Pluto's orbit crosses Neptune's. None of the other seven planets ever get farther away from the sun that Pluto.
the planets containing life form other than earth may have a dangerous species, or the planet itself may be dangerous.
It's highly unlikely that Jupiter was the first planet. There's no evidence that Jupiter formed any earlier than other planets in our solar system, and no reason at all to believe that planets in other older solar systems might not have formed long ago.
of course they did
No,Mars can't bump into Earth because,the gravity isn't strong enough to pull Mars over to Earth. Mars and the earth cant bump because they are in different orbits. They will remain the same distance from the sun and cannot bump into each other.
No, but they will break up into small parts to make other planets
Of course we will. But shall we?
http://nineplanets.org/ is the best site I have ever found regarding planets. I use it extensively teaching 8th grade Astronomy.
Some people believe that spaceships from other planets have visited Earth, but no one has ever been able to prove it.
No, I have never experienced a goldfish bump on my head.
no. no humans have ever been to any of the other planets.
No one actually found any human life on any other planets yet, but there is known to be some plant life out on mars.
Nobody from Earth has ever been to any other planet.
Yes more than you can ever imagine
yes beacuse other planets are far from the moon so u can guees that pluto would almost be pure ice