For more than 100 years, astronomers have been observing a curious star located some 190 light years away from Earth in the constellation Libra. It rapidly journeys across the sky at 800,000 mph (1.3 million kilometers per hour). But more interesting than that, HD 140283 — or Methuselah as it’s commonly known — is also one of the universe’s oldest known stars.
In 2000, scientists sought to date the star using observations via the European Space Agency’s (ESA) Hipparcos satellite, which estimated an age of 16 billion years old. Such a figure was rather mind-blowing and also pretty baffling. As astronomer Howard Bond of Pennsylvania State University pointed out, the age of the universe — determined from observations of the cosmic microwave background — is 13.8 billion years old. “It was a serious discrepancy,” he said.
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Taken at face value, the star’s predicted age raised a major problem. How could a star be older than the universe? Or, conversely, how could the universe be younger? It was certainly clear that Methuselah — named in reference to a biblical patriarch who is said to have died aged 969, making him the longest lived of all the figures in the Bible — was old, since the metal-poor subgiant is predominantly made of hydrogen and helium and contains very little iron. It’s composition meant the star must have come into being before iron became commonplace.
But more than two billion years older than its environment? Surely that is just not possible.
Bond and his colleagues set themselves to the task of figuring out whether or not that initial figure of 16 billion was accurate. They pored over 11 sets of observations that had been recorded between 2003 and 2011 by the Fine Guidance Sensors of the Hubble Space Telescope, which make a note of the positions, distances and energy output of stars. In acquiring parallax, spectroscopy and photometry measurements, a better sense of age could be determined.
“One of the uncertainties with the age of HD 140283 was the precise distance of the star,” Bond told All About Space. “It was important to get this right because we can better determine its luminosity, and from that its age — the brighter the intrinsic luminosity, the younger the star. We were looking for the parallax effect, which meant we were viewing the star six months apart to look for the shift in its position due to the orbital motion of the Earth, which tells us the distance.”
There were also uncertainties in the theoretical modelling of the stars, such as the exact rates of nuclear reactions in the core and the importance of elements diffusing downwards in the outer layers, he said. They worked on the idea that leftover helium diffuses deeper into the core, leaving less hydrogen to burn via nuclear fusion. With fuel used faster, the age is lowered.
“Another factor that was important was, of all things, the amount of oxygen in the star,” Bond said. HD 140283 had a higher than predicted oxygen-to-iron ratio and, since oxygen was not abundant in the universe for a few million years, it pointed again to a lower age for the star.
Bond and his collaborators estimated HD 140283’s age to be 14.46 billion years — a significant reduction on the 16 billion previously claimed. That was, however, still more than the age of the universe itself, but the scientists posed a residual uncertainty of 800 million years, which Bond said made the star’s age compatible with the age of the universe, even though it wasn’t entirely perfect.
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“Like all measured estimates, it is subject to both random and systematic error,” said physicist Robert Matthews of Aston University in Birmingham, UK, who was not involved in the study. “The overlap in the error bars gives some indication of the probability of a clash with cosmological age determinations,” Matthews said. “In other words, the best supported age of the star is in conflict with that for the derived age of the universe [as determined by the cosmic microwave background], and the conflict can only be resolved by pushing the error bars to their extreme limits.”
Further refinements saw the age of HD 140283 fall a bit more. A 2014 follow-up study updated the star’s age to 14.27 billion years. “The conclusion reached was that the age is about 14 billion years and, again, if one includes all sources of uncertainty — both in the observational measurements and the theoretical modelling — the error is about 700 or 800 million years, so there is no conflict because 13.8 billion years lies within the star’s error bar,” Bond said.
Taking a closer look at the age of the universe
Yet Matthews believes the problem has not yet been resolved. Astronomers at an international conference of top cosmologists at the Kavli Institute for Theoretical Physics in Santa Barbara, California, in July 2019 were puzzling over studies that suggested different ages for the universe. They were looking at measurements of galaxies that are relatively nearby which suggest the universe is younger by hundreds of millions of years compared to the age determined by the cosmic microwave background.
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In fact, far from being 13.8 billion years old, as estimated by the European Planck space telescope’s detailed measurements of cosmic radiation in 2013, the universe may be as young as 11.4 billion years. One of those behind the studies is Nobel laureate Adam Riess of the Space Telescope Science Institute in Baltimore, Maryland.
The conclusions are based on the idea of an expanding universe, as shown in 1929 by Edwin Hubble. This is fundamental to the Big Bang — the understanding that there was once a state of hot denseness that exploded out, stretching space. It indicates a starting point that should be measurable, but fresh findings are suggesting that the expansion rate is actually around 10% higher than the one suggested by Planck.
A higher value for the Hubble Constant indicates a shorter age for the universe. A constant of 67.74 km per second per megaparsec would lead to an age of 13.8 billion years, whereas one of 73, or even as high as 77 as some studies have shown, would indicate a universe age no greater than 12.7 billion years. It’s a mismatch that suggests, once again, that HD 140283 is older than the universe. It has also since been superseded by a 2019 study published in the journal Science that proposed a Hubble Constant of 82.4 — suggesting that the universe’s age is only 11.4 billion years.
Matthews believes the answers lie in greater cosmological refinement. “I suspect that the observational cosmologists have missed something that creates this paradox, rather than the stellar astrophysicists,” he said, pointing to the measurements of the stars being perhaps more accurate. “That’s not because the cosmologists are in any way sloppier, but because age determination of the universe is subject to more and arguably trickier observational and theoretical uncertainties than that of stars.”
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