Very interestingly, they found that systems with fewer planets tend to exit their “ejection” phase after about 100 million years, but systems with 10 planets are still unstable even after a billion years. They also found that these more bountiful systems actually eject the majority of their planets, losing 70 percent after a billion years. Most of the ones ejected are lower-mass, as expected.
Wonder how many sibling planets we had when our solar system first formed. This sort of topic is always fascinating to me.
I’ve heard it can be hard to see with the naked eye, and it seems like it would probably get murdered by city lights. Something like some low power, wide-lens binoculars might help collect enough light to make it visible. Also, I’ve heard that cell phone cameras and cameras in general are pretty good at picking up the Aurora over the naked eye, especially on longer exposures.
Sounds about right. The main problem is getting our somewhere dark, where the horizon is visible. There are buildings for miles around, and its really cold because of the winds. I’ve got so many good excuses. I’m glad you have a long list of objects to look for. Its quite impressive, to be honest. I know my way around, but still not that many DSO’s off the top of my head 🙌
They found that Callisto’s ionosphere alone cannot explain all existing observations, but that a subsurface ocean in combination with the ionosphere can. Further exploring which scenarios best fit the data, the researchers predicted that the ocean is likely at least tens of kilometers thick, as measured from the top of the liquid ocean to its seafloor, and encased beneath a solid ice shell that itself could range from tens to hundreds of kilometers thick.
Life on Callisto would have a worldview not unlike that of the Krikkiters.
astronomy
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