In the foreseeable future, a scientific community has discovered an alternate universe in which the solar system centers around a binary system of G-type suns, unlike the one G-type that ours orbits. The first planet is a diamond-crusted carbon planet twice as wide and eight times as massive as Earth, orbiting the second star from a distance of 1.1 million miles. The second planet is a Venus-like planet 175% as wide and five-and-a-half times as massive as Earth, orbiting both stars from a distance of 109 million miles. In the habitable zone is the third planet, an Earth-like planet 5800 miles wide with the following features:
- A gravity 75% that of Earth
- A retrograde rotation (suns rise from the west and set in the east) of 42 hours, a cycle that must be completed 827 times to make up one revolution (an "Asgardian" year)
- A single moon 3,474.2 miles wide and orbiting "Asgard" from a distance of 384,400 miles
- An axial tilt varying from 109.7 to 118.32 degrees every 1.4 million years
This alternate Earth is also more volcanically active, as indicated in the dimensions of its oceans:
- Shallow seas cover 40% of the oceans
- Deep seas cover 32% of the oceans
- Trenches and deeps cover 15% of the oceans
- Abyssal plains are the smallest feature of this alternate Earth's oceans, covering only 13%
The atmosphere consists primarily of carbon dioxide and methane, but it still has 2% as much oxygen as our Earth.
In every respect, it should have life. The problem with that is that it used to have life, but we have just missed a mass extinction severe enough to wipe the slate clean.
This is a map of "Asgard". The red presented at the bottom of the map is the cause of the crisis that wiped out all life--a large basaltic plateau representing a volume of 80,000,000 cubic miles and a maximum elevation of 9,800 feet. Such a series of eruptions would have released enough greenhouse gases to wipe out even the toughest of organisms. So this Earth-like planet is too extreme for our first wave of terraforming pioneers, blue-green cyanobacteria, to thrive. Through a combination of natural and manmade means, how do we cool down the planet and possibly dilute the acidity of the oceans to the extent of making cyanobacterial colonization possible?