Which term refers to the region of space that humans can observe with technology?

Which term refers to the region of space that humans can observe with technology?

• A. Transit
• B. Transmit
• C. Universe
• D. Yearly (annually)

Answer: (C)

Understanding what this question asks helps: we’re naming the region of space we can see using our technology. That region is the observable universe—the part from which light has had time to reach us since the universe began. Because light travels at a finite speed and the universe is ~13.8 billion years old, there’s a practical boundary beyond which we cannot observe (about 46 billion light-years in radius due to cosmic expansion). Among the options, the word that best fits this idea is the universe, used here to refer to the portion of space we can observe with our instruments. The other terms describe movement, sending information, or a time interval, which don’t pertain to what we can observe in space. Note that the observable portion is a subset of the entire cosmos, which is commonly called the universe.

Understanding what this question asks helps: we’re naming the region of space we can see using our technology. That region is the observable universe—the part from which light has had time to reach us since the universe began. Because light travels at a finite speed and the universe is ~13.8 billion years old, there’s a practical boundary beyond which we cannot observe (about 46 billion light-years in radius due to cosmic expansion). Among the options, the word that best fits this idea is the universe, used here to refer to the portion of space we can observe with our instruments. The other terms describe movement, sending information, or a time interval, which don’t pertain to what we can observe in space. Note that the observable portion is a subset of the entire cosmos, which is commonly called the universe.