how long do scientists believe the universe has been expanding?

25,554 results
  1. Science

    Why do scientists use models? a: Scientists use models to learn about things that are too small, too large, or too complex to observe directly. < b:Scientists use models because doing so is always part of the scientific method. c:Scientists use models

  2. science

    Why do scientists use models? a. Scientists use models to learn about things that are too small, too large, or too complex to observe directly. b. Scientists use models because doing so is always part of the scientific method. c. Scientists use models

  3. Science test

    Can someone please help me with science test answers!! Why do scientists use models of natural systems? A- Scientist use models of natural systems because these systems are often too large or too small or too complex to study directly B-Scientists use

  4. ss

    What belief did Zoroaster teach? A. He taught that the universe is dominated by good, not evil. B. He taught that the universe is governed by natural laws, not gods and goddesses. C. He taught that the universe is locked in an eternal struggle between good

  5. Planets

    Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the

  6. Science

    Why is it important for scientists to be open-minded but skeptical? a) Scientists need to generate many new ideas in order to reach a conclusion. b) Scientists need to be able to listen to new ideas but not accept them as fact without testing them. c)

  7. science

    Two im not sure on, please check? What is the true work of all scientists? Scientists ask testable questions and devise ways to answer those questions through experimentation or observation.*** Scientists research other scientists' discoveries and present

  8. history

    Which option accurately describes the significance of the scientific theories of Isaac Newton? A. Newton’s theories helped scientists understand the significance of germs and sterilization. B. Newton’s theories helped scientists understand the

  9. scientific revolution

    1. What did Francis Bacon believe scientists should rely on to explain the laws of nature? a. Greek learning b. Church teachings c. mathematics d. inductive reasoning** 2. What is the first step in the scientific method? a. experiment b. form a

  10. Chemistry

    Which of the following is NOT a statement of the second law of thermodynamics? a. The entropy of the universe is always increasing. b. Every naturally occurring process produces some entropy. c. Energy is conserved in quantity but not in quality. d. Every

  11. science help

    One scientist discovered a new theory on the evolution of the universe. What is the next step for the scientist to take? A. transform the results of the theory into universal laws of nature. B. inform the scientific community so they can verify the

  12. Science

    1) Why can certain stars sometimes be identified as eclipsing binary stars? Answer) B. They become dimmer at regular intervals 2) Which of the following is a major difference between elliptical galaxies and spiral galaxies Answer) A. Elliptical galaxies

  13. Science

    Scientists conduct investigations to answer questions. Before making a valid conclusion, scientists must A collect relevant evidence B tell people about the data C publish results from the investigation D discuss the investigation with other scientists***

  14. physics

    Imagine a parallel universe in which the electric force has the same properties as in our universe but there is no gravity. In this parallel universe, the sun carries charge Q, the earth carries charge −Q, and the electric attraction between them keeps

  15. Science

    Which of the following is an example of how economics can affect science? A. Limited funding may lead scientists to research one topic instead of another. B. Legislators may create new laws about the use of natural resources based on the recommendations of

  16. science

    which of the following possibly outcomes regarding the universe do scientists think is most likely ? a) the universe will continue to expand b) the universe has completed its expansion c) the universe will start shrinking soon d) the universe is already

  17. science help pls pls

    Which statement best explains why the Big Bang Theory is the leading scientific explanation of the development of the universe over time? Its experiments reject all old theories on the origin of the universe. Its experiments yield different results every

  18. science

    From the cosmic background radiation, what can scientists infer that the universe was like after the big bang? A. Very small B. Hot C. The same average temperature as it is today. D. Cooler than it is today. Is the answer C? Thank you for the help😊

  19. science help PLS

    Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists believe that temperatures below the freezing point of ice can also exist. What best accounts for these different opinions?

  20. Astronomy

    Which one of the theories about the universe do you most support: the open universe theory or the closed universe theory?

  21. History

    Which accurately describes Isaac Newton’s clockwork universe theory? A. It compares the universe to a mechanical clock wound up by God, with its gears governed by the laws of physics. B. It compares the universe to London’s Big Ben clock tower,

  22. Science

    What is the best explanation for why scientific theories are modified? A)Theories more than ten years old are usually out of date. B)Scientists want to prove that the work of other scientists is wrong. C)New evidence that supports a revision prompts

  23. i really need help with science pls help

    Two groups of scientists got different results while studying about the origin of the universe. Which of these statements is most likely true about the results of the two groups of scientists? They were not repeated and verified. They provide new testable

  24. science

    Multiple Choice Which of the following is a benefit of having a standard measurement system that can be used by scientists worldwide? A. Scientists can all perform different experiments. B. Scientists can compare and share data with each other. C.

  25. science

    Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists believe that temperatures below the freezing point of ice can also exist. What best accounts for these different opinions?

  26. American Government

    "Universe" is a term used to describe a. a politician's constituency b. the entire group of persons in a given poll. c. the entire group of persons whose opinions a poll seeks to measure d. the group that supports the activities of an interest group A

  27. Science

    Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the

  28. Cosmology

    A curvature constant of k=0, as used in the Friedmann equation, means: * The universe is open * The universe is matter-dominated * There is no dark energy * The universe is flat

  29. Science

    The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The

  30. science help PLS

    Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists believe that temperatures below the freezing point of ice can also exist. What best accounts for these different opinions?

  31. Physics

    If you put a balloon in a warm oven and assume the balloon cannot pop. Will the the balloon continue expanding forever or will it eventually stop expanding?

  32. Language Arts

    which of the following are you most likely to find in a science fiction novel such as The Giver? A. People living in a futuristic environment where rules lead them to act differently than is commonly accepted now. B. Characters from the distant past

  33. math

    Water is falling on a surface, wetting a circular area that is expanding at a rate of 9 mm2 /s. How fast is the radius of the wetted area expanding when the radius is 120 mm? (Round your answer to two decimal places.)

  34. RE

    i have to write a poem about 'your expression of the vastness of space/universe as a poem. i have all the ideas in my head about the universe being incredibly vast. but im rubbish at writing poems. Can anyone help or find a useful website that has a poem

  35. Integrated Physics and Chemistry

    Matching... 1.)zeroth 2.)first 3.)second -heat can change energy from one form to another, but the amount of energy in the universe is constant. -two objects in thermal equilibrium will have no net heat flow between them. -the tendency of the universe is

  36. science

    Which of the following possible outcomes regarding the universe do scientists think is most likely? A. The universe will continue to expand. B. The universe has completed its expansion. C. The universe will start shrinking soon. D. The universe is already

  37. Science-Universe and Stars

    Now i have to conpare the oscilating theory with the expanding universe theory. is the expanding universe theory referring to the big bang? I am sort of stumped on this, your help will be greatly appreciated, thanks

  38. Universe and the Stars

    what s the osc illating theory of universe? the oscilaating theory of the universe is the theory on the universe expanding. The gravitational pull of all the galaxies plus whatever the other matter existed in the universe would be great enough to slow down

  39. earth science

    1. What observations show that the universe is expanding? 2. What can astronomers infer from the fact that other galaxies are moving away from ours? Please help! Thanks :)

  40. Biology

    What is a molecular clock? A)a tool scientists use to date fossils B)a tool scientists use to determine how many mutations a species accumulates over time C)a tool scientists use to determine how long two species have been evolving independently D)a tool

  41. Science

    Explain why Hubble's observation of red shift in light from distant galaxies led him to the discovery that the universe is expanding.

  42. science

    if you believe that the universe is geocentric, you would believe that the is the center of the universe. sun or heliocentric

  43. Philosophy

    Leibniz presents monads as simple substances. Monads are infinite in number, unextended, and windowless, and each mirrors the universe. As a consequence, Leibniz contends that the universe manifests both order and perfection. Why does Leibniz give monads

  44. Physics

    When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

  45. Physics

    When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

  46. Physics

    Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational

  47. Theories in Science

    Why are theories "not proven"? Typically because they involve observations that are beyond our limits. Speculating about the universe is theory because of the size of the universe. Similarly, wetheorize about sub-atomic particles because we can't see what

  48. space

    how long do scientists believe the universe has been expanding?

  49. Science-Universe and Stars

    what s the osc illating theory of universe? the oscilaating theory of the universe is the theory on the universe expanding. The gravitational pull of all the galaxies plus whatever the other matter existed in the universe would be great enough to slow down

  50. Science

    -Explain how and when the universe formed according to the big bang theory? -Explain how and when our solar system formed? -Describe one observation astronomers use to show that the universe is Expanding?

  51. unsolved mysteries astrophysics

    Q3.2 COLLAPSE TIMESCALE (5 points possible) Imagine that you live in a distant galaxy far far away. This galaxy is in a different universe, and so may have different cosmology. It seems that in this distant universe, all galaxies have the same luminosity,

  52. astronomy

    Imagine that you live in a distant galaxy far far away. This galaxy is in a different universe, and so may have different cosmology. It seems that in this distant universe, all galaxies have the same luminosity, which you have worked out is 7.0*10^30 W.

  53. Science

    Describe one observation astronomers use to show that the universe is expanding

  54. Cosmology

    The most cosmological measurements show that the universe is extremely flat (Ωk≈0) and that the surface brightness of objects scales with the fourth power of redshift (SB∝z^−4). If the universe was still expanding, but had strong negative curvature

  55. space

    what did edwin hubble knowtice about the direction of travelof distant galaxies that led him to preopose that the universe is expanding?

  56. Science

    Have I matched the right Scientists with these famous sayings: Scientists: Ptolemy, Kepler, Copernicus, Newton, Galileo, Brahe & Hubble. 1)"I've finally worked out an explanation as to why planets orbit the sun and moons orbit planets. It is gravity that

  57. Cosmology

    The solution of Olbers' Paradox is: - The universe is opaque at large scales - The universe expands - There is simply not enough starlight in the universe - Matter is clustered in such a way that the integral brightness converges

  58. Astronomy

    I have a some questions that I need help on. 1. Which of the following are evidence that the universe has not been here forever? (There are three correct responses) a. Olber's paradox b. The expansion of the universe c. The Cosmic Microwave Background d.

  59. physics

    The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The

  60. science

    From the cosmic background radiation, what can scientists infer that the universe was like after the big bang ? a) very small b) hot c) the same average temperature as it is today d) cooler then it is today

  61. world history

    Which option suggests the wide-ranging influence of the refugee Nazi scientists on US technology? These scientists designed missiles, but they also worked toward future applications of rocket science. These scientists developed the first working prototype

  62. thermodynamics

    Which of these statements are in accord with the three laws of thermodynamics? -A-The entropy of the universe never decreases -B-A nonspontaneous process can occur if it is coupled to a process which is sufficiently spontaneous -C-The temperature of the

  63. Science - History

    Why do you think church authorities forced Galileo to deny his ideas on the universe? To point out, Galileo was the first guy who believed that the universe was heliocentric, and when he tried to convince others, he was tortured, so he took back his words

  64. physics

    The Universe expands according to the Hubble's law: velocity is proportional to distance. There must be some distance, therefore, at which the velocity reaches the speed of light. This defines the horizon. The Doppler shift is so huge that the length of

  65. Social Studies

    What belief did Zoroaster teach? A. He taught that the universe is dominated by good, not evil. B. He taught that the universe is governed by natural laws, not gods and goddesses. C. He taught that the universe is locked in an eternal struggle between good

  66. geography

    can you give me examples of countries in stage 2(early expanding) and 3(late expanding) in the demographic transition cycle ???? thank you rachel

  67. Astronomy

    Why didn’t the Universe collapse into a black hole in the past when there was so much matter in such a small space? (a) Most of the particles in the early Universe were unstable and decayed before a black hole could form. By the time only stable

  68. Physics help

    The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The

  69. english

    (b) Choose two of the scientists you read about in the Stories of Scientists unit. Compare and contrast these scientists. Answer this question in no fewer than two paragraphs. Be sure to include specific details about each scientist’s life, career, and

  70. English

    1. Choose two of the scientists you read about in the Stories of Scientists unit. Compare and contrast these scientists. Answer this question in no fewer than two paragraphs. Be sure to include specific details about each scientist’s life, career, and

  71. English

    Score 1. Choose two of the scientists you read about in the Stories of Scientists unit. Compare and contrast these scientists. Answer this question in no fewer than two paragraphs. Be sure to include specific details about each scientist’s life, career,

  72. Chemistry

    When did these scientists make their contributions ? The years Democritus believes that the universe was made of tiny uncuttable particles. Heisenberg works with the Quantum Theory Chadwick finds the missing mass of the atoms nucleus Dalton's believes that

  73. science

    Is the universe finite or infinite? What is the universe made of?

  74. i really need help with science pls help

    A scientific theory is proposed after several valid investigations. This makes scientific theories elaborate descriptions of observations the most powerful explanation scientists have to offer unchangeable by other scientists over a period of time

  75. HISTORY

    During the turbulence of the 1960s, black activism focused primarily on A. stopping the Vietnam War. B. supporting the nonviolent strategies of Martin Luther King, Jr. C. expanding voting rights. D. expanding economic opportunity. I THINK IS D. IS THAT

  76. Earth Science

    True or false? ------------------------- Although there is scientific evidence and many scientific theories about the origin of the universe, how it all happened remains a question. Which statement is true? ------------------------- The perfect

  77. science

    Can CMB radiation show that the Universe was accelerating at the time the CMB formed thus messuring dark energy early in the universe?

  78. astronomy

    Can CMB show that the universe was accelerating at the time the CMB formed thus measuring dark energy early in the universe?

  79. astronomy

    Can CMB show that the universe was accelerating at the time the CMB formed thus measuring dark energy early in the universe?

  80. physics

    When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

  81. Introduction to Physical Science

    When a cannon with a longer barrel is fired, the force of expanding gases acts on the cannonball for a longer distance. What effect does this have on the velocity of the emerging cannonball? (Do you see why long-range cannons have such long barrels?)

  82. science

    I have a picture that shows what scientists think parts of North America looked like 300 million yrs ago. ie, trees, plants , insects, rocks. How do scientists know what North America looked like so long ago, if there were no people around to see it?

  83. Science 3

    Which of these is NOT a source of the shock waves that lead to protostars? A. radiation from the OB stars in emission nebulae B. expanding Herbig-Haro objects C. expanding planetary nebula shells D. violent supernovae explosions E. collisions between

  84. Cosmology

    What observations were used by Edwin Hubble to show that the universe is expanding? - The distance to a galaxy is proportional to its luminosity. - The distance to a galaxy is inversely proportional to its apparent size. - The distance to a galaxy is

  85. Statistics need help

    Need help please on these questions: 1. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the

  86. english

    need to change all 1st and 2nd person pronouns to 3rd person pronouns for the following: We animals are the most complicated things you will find in the known universe. The universe that we know, of course, is a tiny fragment of the actual universe. There

  87. Logic (quick yes or no question)

    quick yes or no question Is the sun the center of the universe or the earth the center? Neither. The sun is the center of the solar system. Each individual point can be considered the center of the observable universe. The wrote answer of course is no,

  88. Science

    Historical models of the solar system include: A.Helliocentric,B.nebular,C.Geocentric model or earth centered universe and a _ model or sun centered universe

  89. History

    LANDSAT images have changed cartography because A. The images allow scientists to track earths environment*** B. The images allow scientists to view entire mountain ranges C. The images allow scientists to view oceans D. None of the above

  90. Cosmology

    In a universe where the scale factor is proportional to t^α, where t is time and α is a constant less than one, the universe has: * the sign of the acceleration is undetermined * negative acceleration * positive acceleration * zero acceleration

  91. science

    Some theoriests say that in the inflationary period, the scale of the universe increased by a factore of 1050. Suppose your height were to increase by a factore of 1050. How tall would you be? Express your answer in light-years and compare it to the size

  92. 2nd grade

    Why is it helpful for scientists to know how long animals can live?

  93. science

    Why would it be helpful for scientists to know how long animals live?

  94. Math

    Given 5 members, 5 scientists and 9 mathematicians. How many committees can be formed if ..... a. all are scientists? b. exactly 3 mathematicians? c. 2 scientists are not allowed to be in the committee? d. 1 of the scientists and 1 of the mathematicians

  95. space

    Imagine that all gravity in the Universe was magically turned off (except the gravity of the Earth),and everything stopped moving.Earth's gravity will now begin to pull everything in the Universe slowly toward it. True or False?

  96. Statistics

    One last one. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the expansion, while 15% opposed it. a)

  97. World history

    Sorry ik its alot Why did the policy of isolationism no longer work for new American leaders? 2. Why did Mahan suggest establishing a network of bases to support the expanding navy? 3. What were the economic reasons for expanding American territory? 4.

  98. environmental science

    Please check this: Scientists use statistics to a. graph data b. analyze data c. communicate ideas to each other d. all of the above B ( in my book it says: scientists rely on and use statistics to summarize, characterize, analyze, and compare data.

  99. English

    1. We also had science lessons *with famous scientists*. ============================================= Does "with famous scientists" modify 'science lessons'? If "we" are the other lecturers and they were supposed to teach students together "with famous

  100. Physical Geography, Earth Science

    Who were the four other major contributors to the development of modern astronomy after Copernicus? Explain what those contributions were. Finally, why did it take so long for the geocentric view of the universe to be overthrown and what does that tell us

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