1. Which is the closest planet to the Sun? 2. Which planet is known as the “Red Planet”? 3. What is the largest planet in…

1. What percentage of the universe is made of normal (visible) matter? 2. Approximately what percentage of the universe is dark matter? 3. What is…

1. What is a galaxy? 2. Which galaxy do we live in? 3. What is the shape of the Milky Way galaxy? 4. What is…