For all of you astronomy lovers, what if?

Meanderer said:
iu
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Mercury, Venus, and Mars--you would weigh less than on Earth. If you had on a space suit to provide you with heat and oxygen, you could weigh yourself just fine.
 

Warrigal said:
Interesting concept. I guess we would be one part of a binary planetary system where we would be dragged along the orbit of the larger planet, locked in a continuous dance around each other. Sunrise and sunsets would be less regular due to interference caused by the gravitational pull between the twinned planets. I don't even want to think about what would happen to the seasons and plant life.

I'm rather glad that Earth is the Goldilocks planet.
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Well it's a Goldilocks planet for us since this is where we evolved. Another planetary situation in another solar system might evolve a much different type of life form who would consider their planet as a Goldilocks!
 
Have been gradually reading a near 600 page large size color astronomy textbook for months with lots of Hubble photos and by coincidence upon seeing this revived thread, am about to start the "Black holes and Curved space time" chapter.

The OP's link is a good way to compare relative planet sizes. Scifi movies often show views from alien planets looking out at such huge moons, however such worlds would be too gravitationally unstable to evolve organic life. Of course, am still waiting to see a scifi movie where they don't include audio effects during a space battle explosion.
 

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