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Interesting facts about space.
Of course the moon does not magically turn blue in color. But there are some meteorological phenomena or environmental causes that may make the moon appear blue. These include such things as volcanic ash from any large eruption, fine grains of sand or ice crystals suspended in the atmosphere or even from the smoke of large bush fires. Also, if you have been snug in your cottage under an oil lamp and go outside to look at the moon, it will appear blue. This is because our optical organs are governed by an automatic response to 'white balances' much like that of a digital camera, and it will take a moment for your eyes to adjust from being in 'yellow' light.
and here is another
When a moon is in an orbit around its parent-planet, all is well--just as long as the gravity that is holding the moon together in one piece exceeds the powerful, relentless pull of its planet. Alas, if a moon wanders too close, and the tidal forces of the parent-planet exceed the gravitational bind of the unlucky moon, the moon will fall apart. This is termed the Roche limit. Earth's relatively large Moon is a very fortunate natural satellite, and the limit here is a bit under 10,000 kilometers--while our Moon is a safe 385,000 kilometers away from our planet.
The first observations of Mars as an object traveling in Earth's night sky was recorded by the ancient Egyptian astronomers, and by 1534 BCE the ancient astronomers were familiar with the retrograde movement of the planet. By the time of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets, as well as systematic detections of their behavior. In the case of Mars, the ancient astronomers realized that it made 42 circuits of the zodiac every 79 years. These scientists of long ago even invented arithmetic methods so that they could make minor corrections pertaining to the predicted positions of the planets inhabiting our Solar System. The ancient astronomers referred to the planets as "wandering stars".
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In the fourth century BCE, Aristotle recorded that Mars vanished behind Earth's Moon during an occultation. This suggested that the planet was farther away than our Moon. The Greek astronomer, Ptolemy, who lived in Alexandria, attempted to solve the problem of the orbital motion of the Red Planet. Ptolemy's collective works and model on astronomy was presented in his multi-volume collection, titled the Almagest. The Almagest became the authoritative work on Western astronomy for the next 400 years. Ancient Chinese astronomers were also aware of the existence of Mars by no later than the fourth century BCE. In the fifth century CE, the Indian astronomical work titled Surya Siddhanta proposed a measurement of the estimated diameter of Mars. In East Asian cultures, Mars is usually referred to as the "fire star"--based on the Five Elements: fire, wood, metal, water, and earth.
The vanished, ill-fated, large moon could have been a few hundred kilometers in diameter. The large moon would also have allowed a handful of other smaller moons to form--including the duo of small, shapeless ones that survive today. However, this large inner moon would have been born close to or within the Roche limit. This is why it is likely that it crashed into Mars as a result of tidal forces within several million years--and the collection of other small moons followed their leader. Only Phobos and Deimos kept their distance.
Seven sister moons circle Saturn as it whirls around in the realm of the giant planets, so far from the light and warmth of our Sun. The moons have kept the secret of their mysterious origins very well--but they are now beginning to reveal their hidden past.