Mars' two moons present what would appear to you a most striking phenomenon, for one rises in the East and the other in the West, passing each other at times within view of observers. The most distant satellite of Mars is known to us as Laster, to which has been given the name of Deimos by the first observers on your Earth. Approximately 132 hours elapse between its rising and setting at any particular point on our planet, as a consequence of the fact that it revolves in 30 hours 18 minutes at a distance of 14,600 miles more or less from its primary; and as Mars rotates in 24 hours 37 minutes from East to West the motion is almost neutralized by the circulation of this satellite. During the time of its rotation it changes four times from full to new and new to full. The appearance of this satellite to the Martians is equal, if not a little brighter than the view of Jupiter from your Earth. The second satellite, known to us as Benii, and to your astronomers as Phobos, sheds considerable amount of light on the Martian landscape by means of its large size and close proximity, being distant about 3,700 miles from the surface of Mars. This satellite is shut out from view beyond 69 degrees latitude by reason of the curvature of its primary. Its period is 7 hours and 30 minutes--less than one-third the time of the rotation of Mars. It rises in the West and courses across the Heavens in 11 hours, during which time it undergoes one entire cycle of its phases and gets through half another. Its disc appears to us as a little more than half of the moon's disc on your Earth at full appears to you. The realm of Physics presents another interesting study to the Martian student. We have advanced to the study of Nature's laws to a point which would appear to your understanding most incomprehensible. Long ago we mastered the knowledge of the method of releasing Interatomic Energy,[2] a knowledge which in the brain of an unscrupulous person would be most disastrous, not only to himself but to those about him. The energy locked up in an atom of matter is tremendous, and the release of this power is only a matter of knowing the law. The inhabitants of your world will have to bide a long time before the key that will release this giant is placed within their reach. Not until you have eliminated your inherent selfishness; not before you have learnt the lesson as Christ taught it will you be permitted to harness one of the mightiest forces in the universe, a force equally as great for evil as it is for good. This knowledge we have, and we have utilized it in the construction and building of our mighty planetary projects.