Editing Talk:Reach

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We know that, according to Bungie, a year on Reach is 390 local days. Since a local day on Reach is 27 hours, that translates to about 439 Earth days, or '''3.79*10^7 seconds'''.
We know that, according to Bungie, a year on Reach is 390 local days. Since a local day on Reach is 27 hours, that translates to about 439 Earth days, or '''3.79*10^7 seconds'''.


We also know that ε Eri is smaller than the sun, and is about 0.82 Solar masses, or '''1.63*10^30 kg''', according to Wikipedia.
We also know that ε Eri is smaller than the sun, and is about 0.82 Solar masses, or '''1.63*10^30 kg''' <ref>[http://en.wikipedia.org/wiki/Epsilon_Eridani]</ref>


Given these parameters, you can calculate Reach's semi-major axis, or it's average distance from its parent star. Using a little algebra (and a lot of help from Wolfram Alpha), you get a semi-major axis of about 1.58191x10^11 m, or 1.05 AU. A little more than the distance Earth is from the sun. Unfortunately, since ε Eri is smaller and cooler than our sun, this places Reach just outside of the Goldilocks zone, estimated to be 0.5 to 1.0 AU. Space Engine confirmed it, because when I put Reach into the game, it's average surface temp was about -40 degrees Celsius. Though, Bungie does say Reach was Terraformed, so it's possible part of the terraforming process was adding a thick atmosphere full of greenhouse gasses to raise the planet's temperature. But there's also another issue with the planet's orbit. It crosses with the theoretical orbit of the gas giant Epsilon Eridani b, meaning Reach would've been cleared out of the area long ago. Of course, there's a lot of debate over planet b's orbit because of an asteroid belt that should've been cleared out by planet b, so it's entirely possible they got the orbit wrong.
Given these parameters, you can calculate Reach's semi-major axis, or it's average distance from its parent star. Using a little algebra (and a lot of help from Wolfram Alpha), you get a semi-major axis of about 1.58191x10^11 m, or 1.05 AU. A little more than the distance Earth is from the sun. Unfortunately, since ε Eri is smaller and cooler than our sun, this places Reach just outside of the Goldilocks zone, estimated to be 0.5 to 1.0 AU. Space Engine confirmed it, because when I put Reach into the game, it's average surface temp was about -40 degrees Celsius. Though, Bungie does say Reach was Terraformed, so it's possible part of the terraforming process was adding a thick atmosphere full of greenhouse gasses to raise the planet's temperature. But there's also another issue with the planet's orbit. It crosses with the theoretical orbit of the gas giant Epsilon Eridani b, meaning Reach would've been cleared out of the area long ago. Of course, there's a lot of debate over planet b's orbit because of an asteroid belt that should've been cleared out by planet b, so it's entirely possible they got the orbit wrong.

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