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Science and Technology "Somewhere, something incredible is waiting to be known." - Carl Sagan.

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Old April 17 2013, 11:23 PM   #16
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Re: If the Moon were replaced by other planets...

R. Star wrote: View Post
I'd hate to think what all that would do to our oceans. Though we'd be the moon rather than have a moon there.
I wouldn't worry too much about the oceans. The tidal effects of even a much closer moon would tear the crust apart.
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Old April 18 2013, 11:30 AM   #17
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Re: If the Moon were replaced by other planets...

gturner wrote: View Post
Jupiter is 88,736 miles in diameter and the moon is 2,160 miles in diameter, so the area difference is 1,688. The albedo of the moon is 0.12 and Jupiter is 0.52, so the nighttime full moon brightness would go up by 7,313. Bright moonlight is about 0.25 Lux (0.2 to 0.3), so with Jupiter we could have 1,800 Lux. Office lighting is usually 300 to 500 Lux and a TV studio is about 1,000 Lux, as is an overcast day. So it would be very bright indeed.
At a distance of 1 AU from the Sun, agreed. At the distance of Jupiter, about 5.2 AU, the luminous flux would be about 27 times less than that -- 67 lux. Bright sunlight on Earth at 1 AU is about 120,000 lux.

Not disagreeing. I'm being didactic, possible too much so...
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Old April 18 2013, 03:47 PM   #18
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Re: If the Moon were replaced by other planets...

Admittedly it would be easier to move the Earth to Jupiter than vice versa, but if the Earth was out at Jupiter's distance it would be too cold to stand outside making videos.

However it does bring up the not unlikely possibility that in many of the solar systems where we've detected Jupiter size planets orbiting close in (because they're easy to detect), there could be Earth-size moons around the gas giants that would could be perfect for life. The people who live on them no doubt comment on what their sky would look like if they had a regular moon like normal people.
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Old April 18 2013, 06:46 PM   #19
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Re: If the Moon were replaced by other planets...

At 384,000 km, I think the Earth would be within the orbit of Io, which interacts significantly with Jupiter's magnetosphere. It'd be outside the main radiation belts at 100,000 to 140,000 km though. Spacecraft tend to avoid going closer to Jupiter than 300,000 km.
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Old April 19 2013, 05:59 PM   #20
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Re: If the Moon were replaced by other planets...

I don't think the person who created the video tried to be accurate on planetary dimensions versus distance, but rather sought out what would look visually appealing. And it's just about proximity, of course... as anything larger than the Earth would in turn make the Earth its moon.
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Old April 19 2013, 10:48 PM   #21
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Re: If the Moon were replaced by other planets...

Gary7 wrote: View Post
anything larger than the Earth would in turn make the Earth its moon.
If Earth and another body were roughly similar in mass (even one a little greater than the other), the barycenter might be somewhere in open space between them. The two might then orbit around each other like bolas, riding a common orbit around the Sun.
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