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1

Unfortunately, the paper is not available on ArXiv (oh, what hardships we must overcome!), but I have found it here (http://www.slideshare.net/APODman2k/nature13156). In it, where the "900" figure is mentioned (2nd page, I believe), the authors say that they ran simulations with the data already found and their additional findings, and found that 900 ...


0

With the volume and mass of a planet concludes are possible of its material composition. But there is more, for example auroras been observed at Jupiter. This is only possible if Jupiter has a magnetic field just like our earth. A magnetic field is a strong evidence for an iron core. The next point is, heavy materials accumulate in the center, so one could ...


3

This has been the subject of many documentaries, many of which are based on scientific observations and associated assumptions of the past in the rocks and out in space. Some are outright bizarre imaginings of people. The Discover Magazine article about this topic lists several possibilities, including the following examples that scientists have evidence of ...


3

Since I've put a lot of emotional capital into this question, I figure I might as well answer it. Empty criticism is wrong, and I would be guilty of it if I didn't explain what I mean. So here's my attempt. The Big Bang took place roughly 13.8 billion years ago, not 18 billion or 20 billion. One of the most common misconceptions (which I fell into for many ...


2

Read "Death From the Skies!" by Phil Plait. His list is quite comprehensive, going into what can kill humanity, what could destroy all life on Earth, and what could destroy the Earth itself. I don't have my copy on me at the moment, but IIRC he goes into what damage a meteor of various sizes will do. To avoid further confusion, here is a link to the book ...


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Recent studies and simulations reported in the paper Impact-induced compositional variations on Mercury (Edgard et al. 2014), suggest that the Late Heavy Bombardment (LHB) was triggered by giant planet migration during which the main belt and E-belt are excited to higher impact velocities when resonances with the giant planets sweep across the primordial ...


2

The end of the Earth and the end of a habitat that can support life are 2 different things. The Earth will not be able to support life as we know it for 4 billion more years. The sun is slowly heating up, and estimates are that in 500 million years, the Earth will be too hot to support life. That being said, life is resilient, and who knows what ...


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To answer this, we have to consider the definition of an atmosphere. I'll go with Miriam-Webster's online definition: "A mass of gases that surround a planet or star". By that definition, we can say that gas giants are really just planets that are massive enough that they have really massive atmospheres (incidentally, Wikipedia's article on gas giants seems ...



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