Satish,

I am not sure what you are asking.

Are you asking 'what is the surface atmospheric pressure for those planets and moons that have solid surfaces and substantial atmospheres?'

If so, of the known worlds, the surface pressures of Venus, Earth (!), Mars, Titan, and Pluto are well-known.

Thanks again James Garry sir for your time and consideration and answer

I wanted to know at distance from planets and satellite.

What is the status of molecules/ atoms at High vacuum ,if electrons are spreading out side and expansion of molecules/atoms or separation of electrons at High vacuum

Satish,

Atoms and molecules stay the same size. An atom of helium in an otherwise evacuated space does *not* 'expand' because of the reduced pressure. A ball bearing made of diamond does not expand in vacuum - and an electron is held to a nucleus by bonds stronger than those that hold two carbon atoms in a covalent bond.

The electron is bound very firmly to the nucleus and is utterly insensitive to the absence of 1 bar of pressure.

It's true, however, that at astronomically high pressures, atomic orbitals are deformed - and that is another topic. You need pressures commensurate with those in white dwarf stars before atoms become 'non-classical'.