Universe SandboxGeneral CategoryUniverse Sandbox v1 Discussion (2009 version)Journey to the Far Side of the Sun
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Author Topic: Journey to the Far Side of the Sun  (Read 751 times)
theronrr

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Posts: 3
« on: January 04, 2009, 09:53:52 PM »
In the sixes there was a movie called "Journey to the Far Side of the Sun"
Where there was another earth opposite of the sun.  It was a bad movie
but an interesting thought.

It has been fun playing around with the xml files.

I made a copy of the Solar System XML and added
Code:
<Body>
<Object>Earth2</Object>
<Name>Earth2</Name>
<PositionX>1700.0</PositionX>
<PositionY>-1.00au </PositionY>
<PositionZ>0.17</PositionZ>
<VelocityX>29.8418002280664</VelocityX>
<VelocityY>-5.18082741020703</VelocityY>
<VelocityZ>0.000886779706252172</VelocityZ>
<Diameter>12742.02</Diameter>
<Mass>59736</Mass>
<Density>5.515</Density>
<Obliquity>23.45</Obliquity>
<RotationPeriod>23.9345</RotationPeriod>
<Notes>5.9736E+24 kg</Notes>
<Texture>earth.dds</Texture>
<ColorReal>556583</ColorReal>
<ColorVivid>Blue</ColorVivid>
</Body>

The two Earths are not always opposite, but interesting to watch
thought I share it
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FGFG
Beta Team

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Posts: 398
« Reply #1 on: January 05, 2009, 03:16:16 AM »
Quote from: theronrr on January 04, 2009, 09:53:52 PM
The two Earths are not always opposite, but ...

they would be always opposite only if the orbits were circular (in this case the velocity would be costant)  Wink
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Dan Dixon
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« Reply #2 on: January 05, 2009, 10:53:51 PM »
Very awesome...

And here's an easier way to accomplish the same goal:

Code:
<Body>
<Object>Earth</Object>
<Name>Earth 2</Name>
<Action>L3=Sun,Earth</Action>
</Body>

The <Object> tag looks up all of the properties of the Earth. All other two tags modify the default Earth settings. L3, of the Earth & Sun, is an unstable point that's directly opposite the Sun from the Earth. You can also use the commands: L1, L2, L4, L5.

What is the L3 point?
http://en.wikipedia.org/wiki/Lagrangian_point
« Last Edit: January 06, 2009, 12:42:35 AM by Dan Dixon » Logged
FGFG
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« Reply #3 on: January 06, 2009, 02:57:17 AM »
The L3 point isn't at the same distance of Earth from the Sun; it's a little less..  But they are details  Wink
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Dan Dixon
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« Reply #4 on: January 06, 2009, 10:02:02 PM »
That's true... My suggestion is a little different than what theronrr was suggesting.

Something else worth noting is that the 2nd Earth (since it's as large as the 1st) will have a detectable pull on the 1st and change its orbit. The L1, L2, L3 points are all inherently unstable too and won't last too long even under perfect conditions. L4 & L5 are stable and will last indefinitely.
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