Can someone explain compressibility ?

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

What must occur for air masses to form fronts