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I don't understand how they could find a non-planet like Pluto so easily, but a planet-sized planet still eludes them after spending so much time mapping stuff so much further away in such grand detail, compared to what they did with poorly ground lenses 150 years ago.
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More interesting is the article at the link about the search for the 9th planet. Apparently they've done the math and believe it to be far more likely than not that there is another major planet in the solar system and that it's just a matter of time before those looking finally spot it given how many are looking this time around and how good some of the telescopes used are.
I don't understand how they could find a non-planet like Pluto so easily, but a planet-sized planet still eludes them after spending so much time mapping stuff so much further away in such grand detail, compared to what they did with poorly ground lenses 150 years ago.
Pluto reflects about 50% of the light that hits it.
This planet could be anywhere from 1% to 100%, and is an estimated distance of 600 AU from earth (Pluto is 40AU) , and we are very slowly figuring out where to look for it. Space is HUGE, and it's hard to find stuff.