According to National Geographic, the planet Mars is visible without a telescope on many clear nights. The planets Jupiter, Mercury, Venus and Saturn are also viewable without the aid of magnification.
Emotional cheaters usually feel zero guilt for their extramarital relationship. But that is the very definition of emotional infidelity, and the word infidelity is used to describe this type of relationship for a reason... It breaches the bonds of marriage. Even if the body remains monogamous, the heart does not.
Whether it is physical, emotional or cyber cheating, only a party to a relationship or marriage can define for themselves what they view as unacceptable. The only way to define cheating and infidelity is if you feel your expectations of faithfulness from your spouse have been violated.