Doing so can help determine with a degree of certainty what was formerly unknown. — See the box below. It was once the common belief that the earth was the center of the universe.
अलीकडे अतिशय शक्‍तिशाली दुर्बिणींचा शोध लावण्यात आला आणि त्यांच्या साहाय्याने अणूचा अभ्यास करणे शक्य झाले.