Ongoing development in high-precision cosmology may soon provide yet even more compelling evidence for the supernatural origin of the universe. Astronomers’ ability to accurately measure distances to “standard candle” stars has been the limiting factor in their quest to build a precision model for the origin and history of the universe. However, a recent measurement has lowered this limit by a factor of nearly five times.1

Measuring Astronomical Distances
The most critical measurements needed for developing a detailed cosmic creation model are measurements of the cosmic expansion rates at different epochs throughout the history of the universe. Such measurements require knowledge of the velocities at which astronomical bodies are moving away from us and knowledge of the distances to those astronomical bodies. (Expansion rate = velocity/distance.)

Spectra (measurements of the different wavelengths of radiation) of the bodies provide high-precision measures of their velocities, sometimes to better than 0.001 percent. The limiting factor is the distance measurements. Presently, astronomers consider themselves fortunate if they have a distance measurement accurate to ±5 percent.

Standard candle stars provide the pathway toward the best astronomical distance measurements. A standard candle star has a known intrinsic or absolute luminosity. The apparent luminosity of a star is the observed brightness of the star from Earth. This brightness depends on the distance of the object. The inverse square law for light implies that with every doubling of the distance, the apparent luminosity dims by four times. Astronomers define the absolute luminosity of a star as the apparent luminosity it would manifest if it were located exactly 10 parsecs (32.6156 light-years) away.

A standard candle in astronomy is a class of objects that (1) all possess the same absolute luminosity, or (2) all possess a characteristic that permits their absolute luminosity to be calculated. An example of the first category is a type Ia supernovae. When such stars go supernova, at a certain time in their eruptive phase they all manifest the same intrinsic or absolute luminosity. An example of the second category is a Cepheid variable star. Cepheids are regularly pulsing stars. Their pulsation period is related to their absolute luminosity in a known way.

Using the inverse square law of light, astronomers can convert a measurement of the apparent luminosity of a standard candle star into the absolute luminosity of that star. This method assumes, of course, that for that category of standard candle stars astronomers possess an accurate direct distance measurement to at least one such standard candle star.

A direct distance measurement is one based on the plane geometry theorem students learn in high school. For any isosceles triangle, from knowledge of the length of the base of the triangle and the angles at both ends of the base, one can determine the distance to the vertex of the triangle (see figure 1).

blog__inline--quest-for-an-improved-cosmic-creation-model-1Figure 1: Geometric Distance Measuring Method. Measurements of the angles, a and b, and of the baseline distance, C, yields the distance to the vertex, D, free of any assumptions. Image credit: Hugh Ross

One Measurement Breakthrough
An international team of 21 astronomers announced in a recent issue of the Astrophysical Journal that they had achieved the most accurate direct distance measurement to date for a Cepheid variable star.2 Their measurement was possible because the Cepheid variable star they observed, V1334, is orbited by a companion star.

Newton’s laws of motion state that the time it takes for a massive body to orbit another massive body is determined by the diameter of the orbit. Therefore, if astronomers can accurately determine the timing of the orbital period, they gain a measure of the diameter of the orbit in kilometers, light-years, or parsecs. Then, an accurate measure of the angle of the cross section of the orbit as seen from Earth yields a direct, assumption-free measurement of the distance to the two stars (see figure 2).

blog__inline--quest-for-an-improved-cosmic-creation-model-2Figure 2: Geometric Distance Measurement to the Binary Cepheid V1334. A measure of the period of the orbit of the companion star near V1334 yields the diameter of the orbit. A measure of the angle subtended by the orbit as seen from Earth yields the distance to V1334 and its companion star. Image credit: Hugh Ross

The most observationally challenging component of the distance measurement to V1334 was determining the angle subtended (viewed from the vertex) orbit as seen from Earth. The 21 astronomers gained unprecedented accuracy in this angular measurement through observations carried out from July 2012 to October 2016 using the best optical interferometer currently available. They used the Michigan Infrared Combiner (MIRC) installed at the Center for High Angular Resolution Astronomy (CHARA) located on Mount Wilson overlooking the Jet Propulsion Laboratory and the California Institute of Technology in Pasadena, California.

MIRC consists of six 1-meter-diameter optical telescopes placed in a Y-shaped configuration with two telescopes on each branch of the Y. The baselines of the Y can be varied from 34 to 331 meters. The angular resolving power of MIRC is 0.2 milliarcseconds, equivalent to the angular size of a nickel seen from a distance of 10,000 miles away and more than fifty times superior to the best-achievable resolution of the Hubble Space Telescope.

The astronomers’ measurements on V1334 rank as the first time that a binary Cepheid star was resolved both spatially and spectroscopically. They rank, by a factor of nearly five times, as the most accurate geometric distance ever made on a Cepheid variable star. The geometric distance the astronomers measured for V1334 = 720.35 ± 7.84 parsecs (2,349.46 ± 25.57 light-years). That is, the team achieved a distance measurement to V1334 accurate to ± 1 percent.

The researchers also achieved the most accurate mass measurement for a binary Cepheid variable star system. They measured the masses of the two stars to be 4.288 ± 0.133 solar masses (Cepheid) and 4.040 ± 0.048 solar masses (companion). These accurate mass measurements will enable astronomers to develop more detailed models for the burning history of giant stars.

An important caveat noted by the team of 21 is that the companion star is sufficiently close to V1334 as to make separating its light contribution from that of V1334 challenging. Thus, it is premature to claim that a factor of five improvement in cosmic creation models has been achieved. Hence, the team calls for more MIRC observations of the V1334 system and to use MIRC to make observations on other binary star systems.

Nevertheless, these 21 astronomers have demonstrated through their measurements that very-high-precision cosmology is just around the corner. Such high-precision cosmology has the potential to deliver ever stronger evidence for the biblically predicted cosmic creation model.2

Featured image: RS Puppis, one of the brightest Cepheid variable stars in the Milky Way Galaxy. Image credit: NASA/ESA/Hubble Space Telescope

Check out more from Reasons to Believe @Reasons.org

Endnotes
  1. A. Gallenne et al., “A Geometrical 1% Distance to the Short-Period Binary Cepheid V1334 Cygni,” Astrophysical Journal 867 (November 10, 2018): id. 121, doi:10.3847/1538-4357/aae373.
  2. Hugh Ross with John Rea, “Big Bang—the Bible Taught It First!” Facts for Faith, quarter 2, 2000 (July 1, 2000): 26–32, https://www.reasons.org/explore/publications/facts-for-faith/read/facts-for-faith/2000/07/01/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.



Email Sign-up

Sign up for the TWR360 Newsletter

Access updates, news, Biblical teaching and inspirational messages from powerful Christian voices.

Thank you for signing up to receive updates from TWR360.

Required information missing

This site is protected by reCAPTCHA, and the Google Privacy Policy & Terms of Use apply.