Discoverer of two satellites of Uranus Jack Lissauer (Jack Lissauer) from NASA’s Ames Research Center (USA) with colleagues asked this question: exactly how the absence of the moon would destabilize the earth’s axis itself? “If the Earth didn’t have The moon, the slope of its axis of rotation – and thereby the climate – would vary much stronger than now, that’s right, the scientist admits. – But nothing so bad that they showed us previous models would not have happened. ” 
Photo from open sources Thesis on the importance of the moon for stability Earth conditions are very important. The diameter of our satellite is 0.27 terrestrial – that is, its comparative dimensions are colossal. And if moons in other systems massively reached such sizes (in comparing with our planets, of course), we would already have discovered how at least one of them in the data of the Kepler telescope. But this is not happens, and the modern theory of moon formation even explains why: just Selena is not a satellite, but divorced from the once the existing Earthmoon part that arose as a body only in as a result of the collision of this same Earth-Moon with a large planet. Therefore, such cases are not too frequent, and a powerful stabilizer the axis of rotation of the earth-like planets of other systems, too. By previous calculations, without the moon, the axis of rotation of the planet is not would vary in the range 22.0-24.6 °, and would fluctuate in Pantagruel style – from 0 to 85 °, that is, up to lying on sideways! In the latter case, polar night and polar day would become a reality for almost the entire planet, why the climate is unlikely to improve. At 0 °, the northern regions would be uninhabited, others say, and equator – forever overheated. Mr. Lissower and colleagues created own model of axis oscillations, limiting its work to 4 billion years. AND – you will laugh – they turned out that for all this time (equal to the history of the Earth today) the inclination of the earth’s axis did not exceed 40 ° and did not fall below 10 °. “If you take the time necessary for development complex life, then over such a period of change can be, say, ten degrees in both directions, “the researcher is stunned. When this, if the Earth had a retrograde rotation (the Sun would rise on west), which should sometimes be found among the rocky exoplanets of other systems, the oscillations of the tilt axis would be even smaller, because the torsion of the planet around its axis would go in the direction the opposite of the one she travels around a star. 
Photo from open sources If satellites of giant planets Solar correlated with the master planets, like the moon and the earth, around Jupiter would be full of “super-earth.” (Picture by Mary Anne Peters.) Long-term climate variations associated with such processes would really take place, but they can’t be describe as catastrophic, says the scientist. To this stands add the already advanced thesis that the slope is too strong axis (“creep” of the polar night and day) simultaneously with the cooling effect due to an increase in albedo (in the unlit hemisphere per night a lot of ice would form) would increase efficiency planet’s absorption of sunlight, which in theory should give heating effect. This means that the swing range was unlikely to be excessive – and overall the climate situation would not be as dramatic as thought. It makes no sense to limit the detailed the study of earth-like exoplanets by those that have relatively big companions, the scientist believes: life can do without them. The results of the study were presented at the congress of the American Geophysical Union in San Francisco. Alexander Berezin Based on materials from Space.Com
Time Life Climate Moon Exoplanets
