JUPITER
Grammar: Circle the correct word in the brackets [ ] below:
Jupiter is the [largest / most large / larger / large] planet in the Solar System. It is the fifth planet from the Sun. Jupiter is [classifying / classifies / classify / classified] as a gas giant, both because it is so large and due to the fact [which / that / while / who] it is made up mostly of gas. The other gas giants are the planets Saturn, Uranus, and Neptune. Earth is not [making / makes / made / make] up of gas but is a mass of water and rock. Jupiter is absolutely huge. It has a mass of 1.8986×1027 kg, or about 318 Earths. This is twice the size of all the other planets in the Solar System [adding / added / add / adds] together.
Jupiter is 588 million kilometers from the Earth, but it is so big [who / which / that / while] we can see it in the night sky. You need to know [that / what / while / who] you are looking for to see Jupiter because it sometimes looks like a star. In fact, it is the third [bright / brightest / brightens / brighter] object in the night sky. Only the Earth's moon and the planet Venus are [brightest / brighter / bright / brighten].
Jupiter is very different from Earth. While Earth has just one moon, Jupiter has at [last / lest / least / less] 67 moons. Of these, 55 are very small and are [smaller / lower / less / deeper] than five kilometres wide. [A / The / Some / Most] four largest moons of Jupiter have strange names, [gave / given / gives / giving] to them by astronomers hundreds of years ago. They are [calling / call / calls / called] Io, Europa, Ganymede, and Callisto. They are collectively called the Galilean moons, because they were [discovering / discovered / discover / discovers] by the Italian astronomer Galileo in the seventeenth century. Ganymede is the [large / larger / largest / largely] moon in the Solar System.
Jupiter is the third brightest object in the night sky, after the Moon and Venus. This means people have always [was / been / are / is] able to see it from Earth. The first person known to [real / reality / really / realism] study the planet was Galileo in 1610. He [be / was / did / does]the first person to see Jupiter's moons Io, Europa, Ganymede and Callisto. This was because he [uses / used / using / use] a telescope, unlike anyone before him.
No new moons were discovered for [most / more / many / much] than two hundred years after Galileo. In 1892, the astronomer E.E Barnard [finds / find / found / finding] a new moon using his observatory in California. He called the moon Amalthea. It was the last of Jupiter's 67 moons to be discovered by human observation through a telescope. In 1994, bits of a comet [hits / hitter / hitting / hit] Jupiter. It was the first time a collision or crash between two Solar System objects had been directly [seen / saw / seeing / sees] by people.