Snapshot of the Terrestrial Planets

Mercury, Venus, Mars, and Earth are called the terrestrial planets because they all possess certain Earth-like (terrestrial) properties. These include proximity to the sun (within 1.5 A.U), relatively closely spaced orbits, relatively small masses, relatively small radii, and high density (rocky and solid-surfaced). Compared to the larger, more distant jovian planets, the terrestrials rotate more slowly, possess weak magnetic fields, lack rings, and have few moons or none. In fact, within the terrestrial "club" the earth's large moon is unique. The moon is only slightly smaller than the planet Mercury and larger than Jupiter's moon Europa! As we have seen, the moon's large size is one clue to its origin. We'll take a closer look at the terrestrial planets in Chapter 13, "So Close and Yet So Far: The Inner Planets."

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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