Reverse Mars Venus

[Derek Jackson]

I do not believe that this is ASB although it requires a POD between 100 and 10 000 million years old.

WI Venus roughly were in the orbit Mars is?

This was a response to an ASB thread I mentioned.

We have a possibly habitable World roughly where Mars is now.

Does it have an effect on human history before 1960?

How much does it change the space race?

[Leej]

If we're being in strict AH here the chances are there wouldn't be any humans at all.
Having different planetary bodies about the place would mess up comet/asteroid orbits and we'd get extinctions at different times and at different levels to OTL. The chances of humans are slim.
Assuming ASB's keep earth in a protective shell though...
Probally has huge knock on effects on human history. Astrology/astronomy was a big deal to ancient cultures. Having. A dimmer Venus (is this Mars in Venus' place? If so it could well have life, at the very least of the bacterial kind. Maybe even full life with its core staying active due to being closer to the sun- thats a bit further out though) and a big bright blue 4th planet...

[Umbral]

I don't think it would make Mars more habitable. Less if anything. Its atmosphere would be blasted into space a lot quicker, and it would be baked and irradiated beyound belief.

Venus is another matter. The big atmospheric greenhouse effect becomes an asset, and the gravity is close to earths. The big problem is the long rotational period.

Of course if it was in the orbit of Mars, tidal effects from the sun would have been a lot weaker, and it might have had Mars day legth instread.

If so, it could have been very much like a second earth, with much thicker air.