Explanation:
To answer this question it would take pages to write, so I'll give you one example.
We need scientific apparatus because, people cannot understand anything in the universe beyond a very small are with our senses. For example, have you ever looked at the moon through a telescope, you can see almost every big crater on it, yet when you look at it with your eye, can you see anything besides a white sphere with an occasional rabbit? This is just our moon, the closest celestial object to us, Anywhere farther and you cannot see anything beyond a tiny dot in the sky without a telescope. This is one out of millions of reasons why we need scientfic apparatus to help us understand the universe.
