New answers tagged

0

I'm going to answer this in a definition-based manner. Here is the definition of a Hill Sphere according to Wikipedia: The Hill sphere or Roche sphere of an astronomical body is the region in which it dominates the attraction of satellites. Here is the definition of a Lagrange point according to Wikipedia: In celestial mechanics, the Lagrangian ...


3

Systemic geophysical investigations into past variation of the earth's LOD (length of day) date at least from the 1960's (Wells, J. W. 1963. Coral growth and geochronometry. Nature. 197:948–950.) Growth indicators--persistent lines or layers deposited at intervals ranging from 6-hour tide cycles to annual--in mollusks, corals, and other invertebrates, both ...


0

From an analysis of a certain type of Gamma-ray burst (Short, Hard GRB's) it is speculated these are caused by merging neutron stars. It is also theorized that 2 merging neutron stars can create elements, some of the heaviest ones included. This may have increased the amount of gold and other heavy elements on earth. These merging neutron stars also cause ...


3

I will answer the specific case of the Moon disappearing since the more general question, is a bit open-ended. Of course the Moon cannot just "disappear." However, there are very real circumstances where a planet or other stellar object might be disrupted. The best example I can think of is if a sufficiently large asteroid or moon from another planet ...


3

The key to this kind of comparisons is to get a ratio. How much bigger is one number than the other? From Buenos Aires to Los Angeles, there are nearly 10,000km. The size of a grain of sand varies a lot, but let's say it's a millimetre in diameter. That's 4 orders of magnitude in the numbers themselves, then three orders of magnitude from there being a ...


Top 50 recent answers are included