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The fire is now said to be 43 per cent contained, with rain both helping and hindering firefighters in putting the blaze out 鈥?rain kills the spread, but also brings flash floods, not the kind of danger you traditionally associate with firefighting. [Washington Post] http://washingtonpost/blogs/capital-wea ... alifornia/ NASA stanley us Daily Newsletter You May Also Like ScienceSpace Spaceflight NASA Celebrates as Sun-Exploring Spacecraft Confirms Its Still Alive The spacecraft survived scorching temperatures at a record proximity, and is expected to send details of its close call in the new year. By Passant Rabie Published December 27, 2024 stanley mug ScienceSpace Spac stanley website eflight NASA Waits With Bated Breath for Signal From Sun- Eobd What Could Be Cooler Than a Sleek Watch Made From Dead AK-47s
A first complication: twice as large is not the same thing as double the mass. A double-mass Earth is relatively simple to stanley butelka analyze, but if we stipulate that the radius is twice as big, then it depends on what it is made of. Note that if the component rock contributes to water as it does on Earth, a planet with 15 times the mass but only 4 times the area will have a 3.75 times deep stanley cup er hydrosphere, assuming everything equal. That means 16 km deep oceans Dry might still be a waterworld. A lot hinges on whether we assume Double-Earth started out beyond the ice-line of the solar system and moved inwards, in which case it will be really wet, or started out close to the sun and never got much volatiles. In the first case, Wet Double-Earth, the mass will be about 3 Earths and the average density 37% of Earth, with a surface gravity of 0.73 g and an escape velocity of 13.6 km/s. This will have an ocean hundreds of kilometres deep, surrounding a rocky core covered with high pressure warm ices. In the second case, Dry Double-Earth, the mass will be 15 Earths, the density will be 167%, gravity 3.4 g and escape velocity 30 km/s. I used the model of Sotin et al. in Sotin, C., Grasset, O., Mocquet, A. 2007. Mass-radius curve for extrasolar Earth-like planets stanley de and ocean planets. Icarus191, 337-351. How large is the core of Wet Assuming it to be Earth density 5520 kg/m^3 and surrounded by water 1000 kg/m^3 , I get a core 1.22