Change the following paragraph to have better cohesiveness:
Moreover, such methods are completely blind to molecules that have no dipole. By far the most common molecule in the universe is H (hydrogen gas), but it does not have a dipole moment, so it is invisible to radio telescopes.
Moreover, such methods are completely blind to molecules that have no dipole. For example, by far the most common molecule in the universe is H (hydrogen gas), but it does not have a dipole moment, so it is invisible to radio telescopes.