I've read a few stories about what would be appealing about the Earth to alien species, and solar eclipses were one of the things mentioned - what are the odds of another solar system having this sort of size/distance alignment to result in a nearly-perfect apparent size of both the moon and the sun in the sky?
Another I remember being mentioned as potentially a valuable thing is wood.
Things like water and metals and other elements are just much easier to harvest from asteroids, if you're already a species that can travel between the stars; the concept of aliens coming here to suck up our oceans for the water are just not particularly plausible given what we know now.
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Things like water and metals and other elements are just much easier to harvest from asteroids, if you're already a species that can travel between the stars; the concept of aliens coming here to suck up our oceans for the water are just not particularly plausible given what we know now.