IV. Read the following passage and mark the letter A, B, C, or D People used to think that there were six planets moving in a circle around the Sun. Mercury was the nearest to the Sun and Saturn was the furthest away. Most scientists knew that the Earth was the third nearest planet to the Sun, between Venus and Mars, and that Jupiter was between Mars and Saturn. We have now discovered that there are three more planets – Uranus, Pluto, and Neptune. These others are farther from the Sun, and Pluto is the farthest one. From its time of discovery in 1930 Pluto was considered to be the ninth planet in solar system. In 2006 the IAU (International Astronomical Union) changed the definition of ‘planet’ so that Pluto is not a planet, but the second-largest dwarf planet in solar system. So there are eights planets, not six or nine, and the largest is in the middle of them, the fifth away from the Sun. 1. Mercury is the third nearest planet to the Sun. _______ 2. Venus is the brightest of the planets. _______ 3. Pluto has been considered a planet for 76 years. _______ 4. The International Astrological Union changed the definition of ‘planet’. _______ 5. There are five dwarf planets in the solar system. _______ 6. Jupiter is the largest planet in the solar system. _______