Many people - even before telescopes were invented. Lowell was the astronomer who thought he saw canals.
Mars has two moons: Phobos and Deimos.
The orbits of the planets, including Mars, are eliptical, not circular. Keplers observed positions did not fit a circular orbit. The differences led him to discover that the orbits were not circular, but eliptical.
The ice cap on Mars was discovered by Italian astronomer Giovanni Schiaparelli in the 19th century. He observed the ice cap through his telescope in 1877, and his discovery provided important insights into the polar regions of Mars.
Properties have no executive function, they are observed features. One property of Mars is that it is cold compared to Earth, which is due to its greater distance from the Sun, which warms the planets.
White polar caps. Frozen carbon dioxide and water ice.
Mars has two moons: Phobos and Deimos.
Mars has been known for thousands of ears that it is different than the stars and was first observed via telescope by Galileo in 1609.
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He didn't. Mars has been observed from ancient times. Huygens did make some useful observations of Mars.
None has been observed so far.
Jupiter
2 Moons, Phobos and Deimos. :)
Mars discovery can be traced back to ancient civilizations who observed it in the night sky. However, as a scientific study, Mars discovery is credited to Galileo Galilei who observed it through a telescope in the early 17th century.
Mars has been observed since ancient times and nobody is sure who spotted it first as it is only recorded as prehistory.
The orbits of the planets, including Mars, are eliptical, not circular. Keplers observed positions did not fit a circular orbit. The differences led him to discover that the orbits were not circular, but eliptical.
At present there is no observed volcanic activity of Mars. The super volcano of Olympus Mon on Mars is thought to be inactive, dating its past eruption from several to 15+ million years ago.
Not on another planet per se. Venus and Mars have volcanoes, but none have been observed to erupt. Volcanic eruptions have been observed on Io, one of the moons of Jupiter.