As a child or adult, one question that have definitely aroused in everyone's mind is "Is this universe infinite or it has some boundaries?" as a science or astronomy student this might be the first question to arouse in students mind. Coming back to the answer of this beautiful question- The observable universe is still huge but it has limits. This is because we know that the universe isn't infinitely old - we know that the big bang occured some 13.8 billion years ago. So from this we can conclude that the light has had only 13.8 billion years to travel and hence defines the limitations of universe. All we know or scientists believe is that universe is still far above from our observable distance but at some point it has limits for sure.
Now in 1998, the Hubble space telescope (which was named for the astronomer), studied supernovas and found that the universe was expanding more slowly long time ago compared to the pace of its expansion today.
Now this puzzled many scientists, who thought the gravity would gradually slow the expansion of universe or eventually cause it to contract. So this discovery or the explanation of the universe's accelerated expansion led to the hotly debated concept of dark energy, which is thought to be the force that is pulling the cosmos apart at ever increasing speeds.
While this dark energy is thought to make up approximately 73 percent of the universe, the force remains elusive and is yet to be directly detected.
Science staff writer Adrian Cho wrote. "Dark energy may never reveal its nature, Still scientists remain optimistic that nature will cooperate and that they can determine the origins of dark energy".
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