Are there Physics people out there who can answer my questions?

Question

I have a bunch of questions regarding the alignment of fictional planets I made up.

Is there a forum or something that I can post these Questions.

heres the jist
I want two green planets up close to each other.
so they can be seen on each others skies really up close.
I want both of them to be smaller than earth- 1/3 the size.
and one slightly bigger than the other.

I want both of them to be able to safely lay beside each other.
but to eventually collide.
what would happen if these two were to collide?
what would happen to gravity?
would it be possible for comets and loenids to flow backwards up the sky.

What would nightlight be like without a moon but with sunlight bouncing off a green planet.

How many days would be in each year?
how long would the days be?
what conditions would there need to be to make all this possible?
especially to make it that one of the planets had approx 40 days of pure what distance would the sun have to be?

Can I get some links and possibly some diagrams and co-ordinates?

40 DAYS OF PURE DARKNESS-I said 40 days of pure (oops!)

nope I'm no stoner.
I just want to base a story thats not on earth-most movies these days are based around New York and L.A
Even the lord of the rings was filmed in New Zealand and tolkiens story was based in a time and place based largely on earth.
Star Wars's tatooine has two suns (oh wow! :( )
and all fantasy stories are based on fairy tales or the bible.
So I'm creating a place to base all my stories but first I wanted to investigate all the ins and outs instead of my astronomy being totally off!

Answer 1

If you assume that the sun is the same sort of sun as ours, and that you want the same sort of temperatures on the planets, then you'll want them to be the same distance from the sun as earth is, so the year will be the same as ours, 365 Earth days.

Your two planets are just like our earth/moon system except that they are closer to each other, so they will rotate around each other more quickly, and they are more equal in size - Earth is 81 times the mass of the moon, but yours are almost equal.

the month will be shorter because they are closer together. You can choose a value yourself for the length of the month.

You can have two possibilities for day: either the two planets rotate independently, and you can set the days on the two planets to anything you like, or they are locked together so that the day length is equal to the month length, and each planet will always keep the same face towards the other. In this case, the planet will always appear in the same position in the sky, as the Earth does when you are on the moon.

The best thing you can do is to study the Earth ./ Moon system and see what way it turns. Then you can do something similar or different to your imaginary system.

Answer 2

It has to do with action and reaction pairs. to be certain if the cart speeds up (or is moved) we ought to inspect in basic terms the forces on the cart, and forget with reference to the forces on the pony. So, if there's a internet tension on the cart (by the pony) the cart will develop up. It does no longer rely that the cart is exerting an equivalent and opposite tension on the pony.

Answer 3

Are you on crystallised intranvenous drip heroin to the jugular vein?????. Or are you serious

Answer 4

HAVE YOU BEEN SMOKING SOMETHING BLACK AND SWIDGY??? YOUR HEAD IS FUKED UP!!