By Jacqueline Mitton, Simon Mitton
An up to the moment advent to our wisdom of the universe.
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Extra info for Concise Book of Astronomy
The phases of Venus prove that this idea is wrong and that Earth and Venus both circle the Sun. 47 Mars, the Viewed through Red Planet Mars looks like a rusty-red disk. Its surface has various light and dark parts, as well as white ice caps at the north and south poles. Like our Earth, Mars experiences a cycle of seasons — while one half of the planet has summer, the other half has winter. a telescope, the planet summer half of the cap gets smaller as the ice melts m the Sun's warmth. Meanwhile, the other half of Mars is having winter and the polar cap there grows During the course of a Martian year, which is nearly twice as long as an Earth year, changes occur m the appearance of the surface, especially near to the ice caps.
The small circular mare at lower left is Mare Crisium, with three seas above it: from upper left to tm^;;-- Tranquillitatis right: Foecunditatis, and Serenitatis. 43 m The Surface of the Moon The Moon's surface is blanketed by very fine powder. Walking on the Moon is a bit like hiking through talcum of powder Moon with stones in m freshly fallen snow, Moon it. Boots leave a crisp impression, as that will last for millions of years. soil is not at all like Earth soil. It is enhrely made powdered rock— the dust from all those meteorite crashes.
Brilliant Venus gets closer to Earth than any other planet: its near point is only 42 million kilometers away. At its brightest it out- shines everything except the Moon and can be seen in the M ^1 ^j m^^^^^m^' east at sunrise or the west at sunset. Venus is the twin-planet of Earth because they both have the same size and mass. However, their atmospheres are very different. The main gases m our air are oxygen and nitrogen. Instead of these gases, Venus has a suffocating atmosphere of carbon dioxide.