Is our moon's gravitational field strong enough to
retain a gaseous envelope and is there a gas with a sufficiently high
molecular weight that could be used to create an 'atmosphere' for our moon?
Asked by: David Kronick
Our moon has what is called a transient atmosphere.
There is gas on the moon but it is in such a small
quantity that it really doesn't even count as an
atmosphere. As to your question, their is no gas
that can provide a permanent atmosphere to the moon.
Imagine the moon had an atmosphere similar to Earth's.
The sun would heat up the air molecules giving them more kinetic energy
This would cause them to move faster, and faster
until eventually they would reach escape velocity
and leave the planet. The moon's escape velocity
is very small, and thus even a small amount of energy will make
gas on the moon escape from its gravity.
Even the earth is constantly bleeding gas out into space, we
just replenish our air supply through biological processes,
and the occasional asteroid impact that brings in
Answered by: Mike Perkins, Physics/Astronomy Major, Penn State
'In a way science is a key to the gates of heaven, and the same key opens the gates of hell, and we do not have any instructions as to which is which gate.
Shall we throw away the key and never have a way to enter the gates of heaven? Or shall we struggle with the problem of which is the best way to use the key?'