Ratty (blinger) wrote in little_details,

Red Sky

In my book series, there is 12 inhabited planets in a region of space quite distanced from our solar system (but still in the same galaxy). Two of these planets are inhabited by the same species. This species is compatiable with humans (there are several hybrids) and several of the aliens live on or stay on Earth for periods of time. These planets also exist on the same orbit, exactly opposite to each other. I've done this because I presume that this would be the only way to balance their gravity pull.

Now, on these two planets the sky and soil is red. The soil I have no real issue with because we have red soil on Earth. However the red sky poses some problems. I've read some information on wiki about weather, that described the red skies that sometimes happen in the afternoon and mornings, as being caused by the sun shining on the undersides of clouds.

These are my questions:

1. What gas or otherwise, would make the sky permantly red? This has to be compatiable with both the humans and the aliens, because they travel between each other's planets?

2. Is it possible for two similar sized planets, about the size of Mars, to exist on the same orbit, or would they crash into each other because of the force of their gravity?

I hope someone can give me a hand. 


Tags: ~science: astronomy

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