We never fell somewhere, why?

We never fell somewhere, why?

Alex is 4 y. old. He loves light, space, stars, gravity, sounds (he is been playing violin since he was 2 y. old), and many other things that I do not know much about.

1. Yesterday, out of no blue, Alex asked me, ”So, how come, mom, we are on the Earth here, but the SPACE KEEPS US rotating but we never fell somewhere?”

The question is kind of very general. Would you, please, try to explain? I tried to narrow it down by asking my 4 y. old son if he thought that we (our planet) were supposed to fell on our Sun? My feeble explanation to him was that we do rotate and it keeps our planet on the orbit around the sun, just like our moon would not go away from us but yet would not fell down on us, and it stays on the orbit .. . . I do not feel I gave him a good explanation and I am afraid it was not correct to look at the question this way.

2. Alex was asking me “How all the planets are arranged and where and how do they move? Why would not they fell?”-- following his other question that he asked me some weeks ago – “Where the SPACE starts and how big it is?”, and “If you fly from one planet to another planet, and then to the other, . . . then where is the end?”

3. Also he was asking me about the dying stars and “Where do they go”?

4. About the gas's color after the star crashes. “What gives a color to the gas? “(Well, all I could say, it depends what type of gas it is, but it comes to the same question, why?) What is there that makes the gas blue, etc.?

He knows – from his bookies that he reads by himself -- that the temperature of the star is important and the red stars have different temperature than the blue stars, but with the gas I think it's the particles of the gas and the optics, may be?


Thank you.
Valentina and Alex