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A small satellite, only 27 km in diameter, is affecting Mars' atmospheric and geological environment.
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Scientists are analyzing various changes to reveal little by little what material Mars is made of.
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Mars is orbited by two satellites, Phobos and Deimos, which are like Earth's moons.
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These satellites are ellipsoids with diameters of 27 km and 16 km, respectively, much smaller than the moon, which is 3474.2 km.
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Phobos is about 9380 km away from Mars and spins every 7 hours and 30 minutes.
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As Phobos passes between the Sun and Mars, solar eclipses occur up to seven times in three days a year.
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Phobos is small, so even if it covers the sun, a total solar eclipse does not occur, and the time is very short, so it takes 30 seconds.
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If you know exactly when Phobos' meridian passage begins and ends, you can accurately calculate its orbit.
ETH Áö±¸¹°¸®ÇÐ ¿¬±¸¼ÒÀÇ ¾Æ¹Ì¸£ ÄÀº "Æ÷º¸½ºÀÇ ¿òÁ÷ÀÓÀ» ÀÌ¿ëÇØ È¼º ³»ºÎ ¿Âµµ¿Í ±¸¼º¹°ÁúÀ» ÃßÁ¤ÇÒ ¼ö ÀÖ´Ù"°í ¸»Çß´Ù.
"We can use the movement of Phobos to estimate the internal temperature and the composition of Mars," said Amir Khan of the ETH Geophysical Institute.
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