A team led by Nobel Laureate Adam Riess took measurements of 300 visible Type Ia supernovae spread among an assortment of galaxies, as well as around 2,400 Cepheid stars, which pulsate on easily visible wavelengths.
"If we know the initial amounts of stuff in the universe, such as dark energy and dark matter, and we have the physics correct, then you can go from a measurement at the time shortly after the Big Bang and use that understanding to predict how fast the universe should be expanding today," said Riess.
Take your measurements here
The Hubble constant, named after its discoverer American astronomer Edwin Hubble, is the rate at which objects in the universe expand over time.
The new value is 66.53 plus or minus 0.62 kilometers per second per megaparsec 3.26 million light-years .
That figure is 5 per cent more than data from NASA's Wilkinson Microwave Anisotropy Probe WMAP , and 9 per cent more than the readings from the now-defunct European Space Agency's Planck satellite mission.
The second option is that in the early period after the Big Bang, a new kind of subatomic particle burst out travelling at just under the speed of light.