Answer:
Answers are as follows
Step-by-step explanation:
Here's the filled-in version of the passage with the correct information:
"The Sun is in the center of the Solar System and is composed mainly of the elements hydrogen (0) and helium (2). The distance from the Earth to the Sun is also called an astronomical unit (3). Many people dream about building a colony on Mars, but the atmosphere is primarily made of carbon dioxide (4). We have discovered the asteroid belt (5) between Mars and Jupiter, which contains millions of small objects. Jupiter has a total of 79 (6) moons: the four largest moons are easily visible with a telescope and Io (7) is the closest and most active one. Uranus and Neptune are the outermost planets, and it takes Neptune 165 (8) years to complete one orbit around the Sun."