If Earth is the “third rock from the sun,” then Mars is number four. All four inner planets are made of rock. These include Mercury, Venus, Earth, and Mars.
Of course, they look more like pebbles next to the four “gas giants.” These are Jupiter, Saturn, Uranus, and Neptune.
Suppose you’re planning a vacation to some spot in the solar system. Mars is definitely your best bet. After all, it’s right next door – only a seven-month trip away! It also happens to be the most livable planet after Earth. That is, apart from the lack of air, food, and water! Plus, the summer season lasts six months. That’s twice as long as Earth’s. Some summer days, the temperature rises just above the freezing point. And sometimes it reaches 70ºF!
What are the can’t-miss sights on Mars? What should you avoid? Read about the fourth rock before you leave the third.
