ACT Exam  >  ACT Questions  >  Halley’s comet completes one revolution... Start Learning for Free
Halley’s comet completes one revolution around the sun in:
  • a)
    40 years
  • b)
    46 years
  • c)
    60 years
  • d)
    76 years
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Halley’s comet completes one revolution around the sun in:a)40 y...
Halley's Comet completes one revolution around the Sun in approximately (d) 76 years. This periodic comet is visible from Earth roughly every 75–76 years. It was last seen in 1986 and is predicted to return in 2061. Named after the astronomer Edmond Halley, who calculated its orbit in 1705, Halley's Comet is one of the most well-known and studied comets in history.
View all questions of this test
Explore Courses for ACT exam

Similar ACT Doubts

Directions: Read the passages and choose the best answer to each question.PassageNATURAL SCIENCE: Those Jellystone BearsOver the years, there have been countless fansof the classic Hanna-Barbera cartoon character YogiBear. The cartoon series enjoyed by young and oldalike revolved mostly around the misadventures of this(5) loveable bear and his sidekick Boo-Boo as theyattempted to snag “pic-a-nic” baskets in the made-upland of Jellystone Park. It’s not often that people thinkabout where the ideas for these cartoons characterscome from, which brings up an interesting point: do(10) bears actually search for food left in picnic basketsand unattended campsites? Anyone who has watchedan episode of Yogi Bear can see that the bears’ behav-ior goes far beyond the limits of what is natural. Thething which must be explored, then, is which of those(15)humorous antics were license on the part of Hanna-Barbera, and which were actually based on the bear’snormal behaviors.Remarkably enough, bears have been known toseek out food from some unlikely sources, including(20)picnic baskets, on top of their usual diet of berries,insects, and fish. Bears work throughout the summerand fall to build up fat stores so as to have energyenough to last them through their winter hibernations.Related to this is their need to replenish their depleted(25)reserves when they wake up in the spring. Food is gen-erally scarce in the early spring, and consequently theywill gladly indulge in any foods that are high in pro-teins or fats. This is the main reason for many incidentsinvolving bears entering campsites in search of food.(30)Although this behavior may seem strange, it isno more than the result of nature equipping bears witha variety of traits that allow them to remain well fedin increasingly human-populated habitats. Specifically,the American black bear, Ursus americanus, has color(35)vision and has been observed by scientists using itscolor vision to distinguish between varying food itemsat close range. On top of this, all bears have an acutesense of smell and can use their especially sensitive lipsto locate food. These sensory talents contribute to the(40)bears’ remarkably high intelligence and curiosity, giv-ing them the ability to open closed containers if theybelieve food is inside. Their exploratory and naviga-tional skills are also worthy of note—most bears willmaintain vast territories in order to obtain food from(45)a variety of sources. Bears may even vary their sleepcycles in areas where there is a large degree of humanactivity, either feasting on road-side garbage during theday or scouring campsites for leftovers at night.Yet another strange but true comparison is that(50)Yogi and Boo-Boo have developed a social relationshipmuch like the ones that will form between wild bearswhen several animals find themselves sharing a limitednumber of food sources. Generally solitary, black bearswill create a hierarchical order in situations where paths(55)cross in pursuit of food, so as to assure that all animalsremain adequately fed. While it is unlikely that anyblack bears in nature would actually send a cub after acamper’s lunch, the behavioral relationships that mightinspire the creation of such a story are indeed real.(60)Though many of the features of the comical YogiBear are likely the result of pure imagination, thereis scientific fact behind at least some of his activities.Despite his apperance as a brown bear, the distinctivefeeding behaviors of the American black bear match(65)remarkably well with the habits of the cartoonish cul-prit. The uncanny truth behind little known scientificfacts such as these should make everyone think twicethe next time they sit down to watch Saturday morningcartoons.Q.One of the main observations made in the next-to-last paragraph (lines 49–59) is that

Directions:Read the passages and choose the best answer to each question.PassageHUMANITIES: Mythology of the Chinese ZodiacEveryday, one takes for granted the ease of findingout what date it is. This is simplified to such a greatdegree by following the Gregorian calendar, based onthe solar cycle, which keeps track of 365.25 days(5) each year. This has not always been the case, however. In ancient China, the calendar was based on thelunar cycle, and consisted of a repeating twelve-yearsequence, each named for a different animal.The origin of the twelve animals is mythological,(10) with the story being passed down from generation togeneration. A common telling of the tale recounts acelebration to honor the Jade Emperor; all of the ani-mals were expected to pay tribute to him on the nightof the New Year and the first twelve to arrive would(15) receive a great distinction.In order to reach the Emperor’s Palace, the ani-mals were required to cross a fast-moving river. Thecunning rat arrived first, climbed atop the ox, who wasa much stronger swimmer than the rat, and jumped off(20) of the ox right before reaching shore, so as to win therace. The ox received second place, followed shortlythereafter by the tiger - the strength of both animalsallowed them to finish quickly. The rabbit followed,with his agility, by jumping from stone to stone across(25) the river. Next came the mighty and majestic dragon,who flew across the river. When asked why he wasnot first, he replied that he needed to make rain forthe people of Earth and was thus delayed. His kind-ness earned him the fifth place in the cycle. During the(30) dragon’s explanation there was a galloping sound, sig-naling the arrival of the horse. Suddenly, hidden coiledaround the leg of the horse, appeared the snake - nearlyas cunning as the rat - who darted in front of the horsetaking sixth place. The horse settled for seventh, just(35) as a raft reached the shore with three more animals.The sheep (eighth), the monkey (ninth), and the rooster(tenth) had worked together to build a raft and traversethe river using their combined efforts. For this showof teamwork they were rewarded in the order that they(40) stepped off of the raft. Next to arrive was the dog, whowas met with questioning looks. Supposedly the bestswimmer, the dog’s lateness was due to his taking abath in the refreshing waters of the river. His vanitynearly cost him the race. Lastly was the lazy pig, who(45) stopped on the other side of the river for a feast beforea attempted to cross, and was so weighed down by itsmeal that it arrived only moments before the Emperordeclared the race to be finished.Missing from this list of animals is the cat. Sadly,(50) he was a victim of the rat’s cunning; the day before therace the rat informed the cat that he would awaken himprior to the race, so as to allow the cat to rest and saveits strength for the race. The day of the race arrived,and the cat continued to sleep while the rat took his(55) spot atop the ox. When the cat awoke, the race wasfinished, and it has hated the rat for what it did eversince.Beyond the twelve-year distinctions that the ani-mals of the Zodiac lend to the calendar, there is an(60) additional ten-year overlay of five elements: water,wood, fire, metal, and earth. Each of these elementsoccurs two years in a row, in balance with the Yang andYin, the governing forces of all things. Even numberedyears are considered Yang, and odd numbered years(65) are considered Yin. When all factors are combined, asixty-year repeating calendar results, the current cycleof which began in 1984.Despite its complexity, the Calendar is followedto a certain degree, and the Chinese New Year is(70) celebrated by many. Primary among the great astrolog-ical purposes to the Zodiac is the common belief thatthe animal that governs the time of a person’s birth willinfluence that person’s personality for life. Whether ornot that is true is a matter of debate that is sure to(75) continue for many years to come.Q.According to the passage, all of the following are true regarding the animals that reached the Emperor’s Palace EXCEPT

Directions:Read the passages and choose the best answer to each question.PassageEarth’s habitability is sustained by the sun. Currently, the sun provides enough light and warmth to maintain temperature conditions that can support life on our planet. It is undisputed that the sun is a star. All stars go through phases where they change in size, temperature, and brightness. Two scientists present their views on how long Earth will remain habitable.Scientist 1Earth’s sun has another 7 billion years before it enters the Red Giant phase. Currently, Earth could not sustain human life during the Red Giant phase. However, it is important not to believe that human life on Earth will immediately cease to exist as we know it in 7 billion years. Technology has played a huge role in helping humans adapt to conditions on this planet. We humans have 7 billion years to advance technology and find solutions to adapt to the atmospheric changes the Red Giant phase would bring. For instance, creating a large sunshade to protect Earth would allow life to continue even when the sun enters the Red Giant phase. Another solution would be to develop technology that would stir the sun and bring new hydrogen to the sun’s core. This would greatly extend the current phase that our sun is in. There is enough time and incentive to discover ways to thwart the natural progress of nature. Therefore, I believe that human life on this planet will exist indefinitely.Scientist 2The sun will enter its Red Giant phase in about 7 billion years. However, new models suggest that Earth has less than a billion years before atmospheric carbon dioxide levels drop to levels that can no longer support photosynthesis.This would lead to a dramatic temperature increase. Once Earth’s average temperature rises to above 70 C, the oceans will evaporate and Earth’s water sources will be almost completely eliminated. One billion years is not long enough for humans to evolve in order to meet large atmospheric and environmental changes, or to develop the technology needed to make Earth habitable. In a billion years, atmospheric changes will eliminate all life on Earth as we know it. Humans need to accept the reality that advanced life flourishes for only a limited period of time. Science fiction— inspired plans to create space colonies or massive sunshades are unrealistic and will not likely be developed in the next billion years.Q.Which of the following does Scientist 1 suggest would postpone the sun reaching its Red Giant phase?

Directions:Read the passages and choose the best answer to each question.PassageEarth’s habitability is sustained by the sun. Currently, the sun provides enough light and warmth to maintain temperature conditions that can support life on our planet. It is undisputed that the sun is a star. All stars go through phases where they change in size, temperature, and brightness. Two scientists present their views on how long Earth will remain habitable.Scientist 1Earth’s sun has another 7 billion years before it enters the Red Giant phase. Currently, Earth could not sustain human life during the Red Giant phase. However, it is important not to believe that human life on Earth will immediately cease to exist as we know it in 7 billion years. Technology has played a huge role in helping humans adapt to conditions on this planet. We humans have 7 billion years to advance technology and find solutions to adapt to the atmospheric changes the Red Giant phase would bring. For instance, creating a large sunshade to protect Earth would allow life to continue even when the sun enters the Red Giant phase. Another solution would be to develop technology that would stir the sun and bring new hydrogen to the sun’s core. This would greatly extend the current phase that our sun is in. There is enough time and incentive to discover ways to thwart the natural progress of nature. Therefore, I believe that human life on this planet will exist indefinitely.Scientist 2The sun will enter its Red Giant phase in about 7 billion years. However, new models suggest that Earth has less than a billion years before atmospheric carbon dioxide levels drop to levels that can no longer support photosynthesis.This would lead to a dramatic temperature increase. Once Earth’s average temperature rises to above 70 C, the oceans will evaporate and Earth’s water sources will be almost completely eliminated. One billion years is not long enough for humans to evolve in order to meet large atmospheric and environmental changes, or to develop the technology needed to make Earth habitable. In a billion years, atmospheric changes will eliminate all life on Earth as we know it. Humans need to accept the reality that advanced life flourishes for only a limited period of time. Science fiction— inspired plans to create space colonies or massive sunshades are unrealistic and will not likely be developed in the next billion years.Q.The views of both scientists are similar because they both argue that

Top Courses for ACT

Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer?
Question Description
Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? for ACT 2025 is part of ACT preparation. The Question and answers have been prepared according to the ACT exam syllabus. Information about Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for ACT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for ACT. Download more important topics, notes, lectures and mock test series for ACT Exam by signing up for free.
Here you can find the meaning of Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Halley’s comet completes one revolution around the sun in:a)40 yearsb)46 yearsc)60 yearsd)76 yearsCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice ACT tests.
Explore Courses for ACT exam

Top Courses for ACT

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev