A little more than a month ago the internet and popular press were abuzz about a paper published by a team of astronomers led by Nobel laureate, Adam Riess. Riess and his team reported measurements that indicated that the universe might be a little more than a billion years younger than the date determined from analyzing a map of the cosmic background radiation—the radiation left over from the cosmic creation event.1 As one web article commented, the new measurements are “upending one of the few things scientists felt certain about”2 and consequently “the birth of the universe is shrouded in guesses and hypotheses.”3 Another web article stated that astronomers “lost track of time”4 and quoted Riess in saying that “we’re not passing this test [the age of the universe]—we’re failing the test!”5

Such publicity prompted the Institute for Creation Research to post an article in which young-earth creationist physicist Jake Hebert asserted that the apparent contradiction between the two measures of the age of the universe was more evidence that “problems with the Big Bang are legion” and that “secular astronomers have wasted, and continue to waste, who-knows-how-many millions (perhaps billions?) of taxpayer dollars attempting to prop up a failing cosmology.”6

Is the big bang creation model really in as much trouble as these article authors imply? Are astronomers confused or feeling that their certainty about big bang cosmology will be upended? Is there a contradiction between the two measurements of the cosmic expansion rate?

Why the Answer Is No
For a variety of reasons, the answer to all three questions is no. Here is the basis for the paper and web articles. Riess’s team observed 20 detached eclipsing binary stars and 70 Cepheid variable stars in the Large Magellanic Cloud galaxy that yielded a measure of the cosmic expansion rate equal to 74.03±1.42 kilometers/second/megaparsec. (A megaparsec = 3,261,560 light-years or 19.174 million trillion miles.) This measure is about 9 percent faster than the one derived from the Planck satellite map (see figure) of the cosmic microwave background radiation (the radiation remaining from the cosmic creation event) which was 67.3±1.2 kilometers/second/megaparsec. However, it is important to recognize that these two measures do not stand alone.

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Figure: Final Planck Map of the Cosmic Microwave Background Radiation. Image credit: ESA, Planck Collaboration

Other astronomy research teams have also produced high-quality measurements of the cosmic expansion rate. They are listed together with these two in the table below.

Cosmic Expansion Rate Measurements

Method Measurement
masers in NGC 4258 72.0±3.0
masers in 3 other more distant galaxies 67.6±6.0
Cepheids/type Ia supernovae (2017) 70.6±2.6
Cepheids/type Ia supernovae (2019) 74.0±1.4
cosmic microwave background (Planck) 67.3±1.2
cosmic microwave background (WMAP) 69.3±0.8
baryon acoustic oscillation 67.3±1.1

First, it is important to note that of the seven measurements in the table, the two mentioned above are the farthest apart from one another. The other measurements are not so discrepant.

Second, the first four measurements are cosmic expansion rates for the late universe (the recent history of the universe) while the last three measurements are cosmic expansion rates for the early universe (that part of cosmic history shortly after the beginning of the universe). Thanks to both the cosmic mass density and the cosmic dark energy density, the universe must expand at a slower rate when it is young than it does when it is older.

As the universe expands, its space surface gets larger. Dark energy’s power to accelerate the expansion of the universe is proportional to the size of the cosmic space surface. Hence, due to dark energy alone the universe should expand faster as it gets older.

The expansion of the universe implies that clumps of mass in the universe will move progressively farther apart from one another. Thus, the mutual gravitational attraction of the mass clumps will gradually decrease. That is, as the universe gets older, the mass clumps become progressively weaker in their capacity to slow down the expansion of the universe.

Accounting for Different Measures
Riess’s team pointed out the problem that the difference between their measurement of the cosmic expansion rate and the rate derived from the Planck map of the cosmic microwave background radiation, 6.7 kilometers/second/megaparsec, is too large to be explained by the simplest models for the nature of dark energy and dark matter. However, in their paper they argue that both their measurement and the measurement derived from the Planck map of the cosmic expansion rate are correct. Thus, they conclude that the discrepancy can be resolved by adjusting the currently standard big bang creation model, what is known as the ΛCDM model (a universe dominated by dark energy, Λ, and secondarily by cold dark matter, CDM), by including the effects of “exotic dark energy, a new relativistic particle, dark matter-radiation or neutrino-neutrino interactions, dark matter decay, or a small [cosmic] curvature, each producing a different-sized shift [in the cosmic expansion rate].”7

What Riess and his colleagues are proposing is not at all considered “upending” or an appeal to “guesses and hypotheses.” Astronomers already possess evidence that dark energy may be more complex than the explanation that it is governed by a single cosmological constant. They also have some evidence for dark matter decay and possible dark matter interactions.

While Riess and his team believe that the cosmic expansion rate discrepancy is real, it may not be as large as what they claim. An average of all four cosmic expansion rate measures in the above table, based on the late history of the universe, is 71.1 kilometers/second/megaparsec. An average of all three cosmic expansion rate measures in the above table, based on the early history of the universe, is 68.0 kilometers/second/megaparsec.

In this case, the discrepancy is a little less than half of what Riess’s team cites in their paper. It is low enough that, in view of the error bars on the measurements, there may be no need to appeal to the adjustments suggested by Riess and his colleagues. At the least, the lower discrepancy calls for a deeper study of systematic errors. Systematic errors are possible offsets or multipliers of measurements due to instrumental effects and possible failures to properly calibrate or account for other natural phenomena that could influence the outcomes of the measurements.

Examples of relevant possible systematic effects include: (1) if the measurement produced by Riess’s team featured a much-improved calibration of the wide-field camera infrared detector on the Hubble Space Telescope; and (2) if the earlier 2015 measurement in the above table—using the same method of observing eclipsing binary stars, Cepheid variable stars, and type Ia supernovae to determine the cosmic expansion measure—featured a correction for star formation bias.8 These two systematic effects and others may explain why the two measurements, both based on eclipsing binary stars, Cepheid variable stars, and type Ia supernovae, yielded a difference of 3.4 kilometers/second/megaparsec. Fortunately, as Riess and his colleagues point out, high-resolution imaging from the soon-to-be-launched James Webb Space Telescope and the largest ground-based telescopes with adaptive optics will likely reduce these systematic errors and others to much below 1 percent.

Personally, I do not think systematic errors alone will account for the 9 percent difference between the cosmic expansion rate determinations by Riess’s team and from the Planck map of the cosmic microwave background radiation. Nor do I believe that any one of the five adjustments suggested by Riess’s team by itself will resolve the difference. I am persuaded, based on the best currently available observations, that resolving the difference will likely require a combination of two or more of:

  • improved understanding and determination of systematic effects,
  • dark energy proving to be more complicated than being governed solely by the cosmological constant,
  • dark matter radiation and/or particle interactions, and
  • the decay of one or more dark matter particles.

In my opinion, measurements of the geometry of the universe rule out a small cosmic curvature influencing the cosmic expansion rate to any significant degree.

I also see little chance that the determined age of the universe will shrink from 13.8 to 12.6 billion years. There are just too many different observational methods, independent of the cosmic expansion rate, pointing to an age between 13.0 and 13.9 billion years.9

Current Status of the Big Bang
In light of these recent observations, what is the status of the big bang creation model and how should we respond to young-earth creationists? It seems like the acronym, ΛCDM, will need to be expanded. Young-earth creationists are correct in pointing out that the big bang model has been evolving. However, it has been evolving in a manner that proves the big bang creation model rather than negating it.

The model has progressed from a big bang model to a hot big bang model, to a hot inflationary big bang model, to a hot inflationary big bang model where the universe is dominated by dark energy and secondarily by cold dark matter, to now an even more detailed big bang creation model. Young-earth creationists have cited each of these adjustments as failures for the model. However, none of these adjustments required an abandonment or major alteration in the big bang model. Rather, each provided additional evidence for its veracity.

No scientific model is or ever will be complete. There is always more to learn. Scientists affirm that a model is very likely correct when it extends their knowledge and understanding about some aspect of the natural realm and they are able to make the model progressively more detailed and comprehensive in its explanatory power. By these yardsticks, the big bang creation model is a spectacular success, and the paper published by Riess and his colleagues adds to that success. I look forward to one or two letters being added to the ΛCDM acronym.

I also look forward to scientists and laypeople who are not yet followers of Jesus Christ (and to young-earth creationists) recognizing that astronomers were not the first to conceive of the big bang creation model. Six Old Testament authors scooped astronomers by 2,500 years and more. For over two millennia the Bible stood alone as the only book declaring the fundamental features of big bang cosmology.10 This outstanding prediction is powerful evidence for the inspiration, inerrancy, and divine authority of the Bible. Now, we have even more scientific evidence that the Bible is the inspired, inerrant, authoritative Word of God.

Featured image: The Large Magellanic Cloud with Inset of Star Cluster Studied by Riess et al. Image credit: NASA/ESA, A. Riess (STScI/JHU), and Palomar Digitized Sky Survey

Check out more from Reasons to Believe @Reasons.org

Endnotes
  1. Adam G. Riess et al., “Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics beyond ΛCDM,” Astrophysical Journal 876, no. 1 (May 1, 2019): id. 85, doi:10.3847/1538-4357/ab1422.
  2. Anna Harnes, “Scientists Believe Universe Is 1 Billion Years Younger Than Originally Thought—and Expanding Much Faster,” Inquisitr, May 31, 2019, https://www.inquisitr.com/5461690/scientists-believe-universe-is-1-billion-years-younger-than-originally-thought-and-expanding-much-faster/.
  3. Harnes, “Scientists Believe Universe.”
  4. Corey S. Powell, “The universe may be a billion years younger than we thought. Scientists are scrambling to figure out why.” NBC News, May 18, 2019, https://www.nbcnews.com/mach/science/universe-may-be-billion-years-younger-we-thought-scientists-are-ncna1005541.
  5. Powell, “The universe may be a billion years younger.”
  6. Jake Hebert, “Big Bang Hubble Contradiction Confirmed,” Institute for Creation Research, May 16, 2019, https://www.icr.org/article/big-bang-hubble-contradiction-confirmed/.
  7. Riess et al., “Large Magellanic Cloud,” 2.
  8. M. Rigault et al., “Confirmation of a Star Formation Bias in Type Ia Supernova Distances and Its Effect on the Measurement of the Hubble Constant,” Astrophysical Journal 802, no. 1 (March 20, 2015): id. 20, doi:10.1088/0004-637X/802/1/20.
  9. I provide a comprehensive survey of these observational methods and their cosmic age outcomes in The Creator and the Cosmos, 4th edition (Covina, CA: RTB Press, 2018), 59–75.
  10. Hugh Ross, “Big Bang—the Bible Taught It First!” RTB 101, June 30, 2000, https://www.reasons.org/explore/publications/rtb-101/read/rtb-101/2000/06/30/big-bang-the-bible-taught-it-first.

 

About The Author

Dr. Hugh Ross

Reasons to Believe emerged from my passion to research, develop, and proclaim the most powerful new reasons to believe in Christ as Creator, Lord, and Savior and to use those new reasons to reach people for Christ. I also am eager to equip Christians to engage, rather than withdraw from or attack, educated non-Christians. One of the approaches I’ve developed, with the help of my RTB colleagues, is a biblical creation model that is testable, falsifiable, and predictive. I enjoy constructively integrating all 66 books of the Bible with all the science disciplines as a way to discover and apply deeper truths. 1 Peter 3:15–16 sets my ministry goal, "Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, keeping a clear conscience." Hugh Ross launched his career at age seven when he went to the library to find out why stars are hot. Physics and astronomy captured his curiosity and never let go. At age seventeen he became the youngest person ever to serve as director of observations for Vancouver's Royal Astronomical Society. With the help of a provincial scholarship and a National Research Council (NRC) of Canada fellowship, he completed his undergraduate degree in physics (University of British Columbia) and graduate degrees in astronomy (University of Toronto). The NRC also sent him to the United States for postdoctoral studies. At Caltech he researched quasi-stellar objects, or "quasars," some of the most distant and ancient objects in the universe. Not all of Hugh's discoveries involved astrophysics. Prompted by curiosity, he studied the world’s religions and "holy books" and found only one book that proved scientifically and historically accurate: the Bible. Hugh started at religious "ground zero" and through scientific and historical reality-testing became convinced that the Bible is truly the Word of God! When he went on to describe for others his journey to faith in Jesus Christ, he was surprised to discover how many people believed or disbelieved without checking the evidence. Hugh's unshakable confidence that God's revelations in Scripture and nature do not, will not, and cannot contradict became his unique message. Wholeheartedly encouraged by family and friends, communicating that message as broadly and clearly as possible became his mission. Thus, in 1986, he founded science-faith think tank Reasons to Believe (RTB). He and his colleagues at RTB keep tabs on the frontiers of research to share with scientists and nonscientists alike the thrilling news of what's being discovered and how it connects with biblical theology. In this realm, he has written many books, including: The Fingerprint of God, The Creator and the Cosmos, Beyond the Cosmos, A Matter of Days, Creation as Science, Why the Universe Is the Way It Is, and More Than a Theory. Between writing books and articles, recording podcasts, and taking interviews, Hugh travels the world challenging students and faculty, churches and professional groups, to consider what they believe and why. He presents a persuasive case for Christianity without applying pressure. Because he treats people's questions and comments with respect, he is in great demand as a speaker and as a talk-radio and television guest. Having grown up amid the splendor of Canada's mountains, wildlife, and waterways, Hugh loves the outdoors. Hiking, trail running, and photography are among his favorite recreational pursuits - in addition to stargazing. Hugh lives in Southern California with his wife, Kathy, and two sons.



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