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zeromodz
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This is hubbles constant from my source
74.2 ± 3.6 (km/s)/Mpc
What does the ± mean?
74.2 ± 3.6 (km/s)/Mpc
What does the ± mean?
Hubble's Constant is a value that describes the rate at which the universe is expanding. It is named after the American astronomer Edwin Hubble who first discovered this expansion in the 1920s. This constant is important because it helps us understand the age and size of the universe, as well as the rate at which galaxies and other celestial objects are moving away from each other.
Hubble's Constant is measured using a variety of methods, such as observing the redshift of galaxies, the brightness of supernovae, and the cosmic microwave background radiation. These measurements can then be used to calculate the expansion rate of the universe and determine the value of Hubble's Constant.
Yes, there is evidence to suggest that Hubble's Constant has changed over the history of the universe. The expansion rate of the universe is affected by various factors, such as the amount of matter and energy present, which can cause fluctuations in the value of Hubble's Constant.
Hubble's Constant is typically measured in units of kilometers per second per megaparsec (km/s/Mpc). This means that for every megaparsec (a unit of distance equal to about 3.26 million light-years), the universe is expanding at a rate of a certain number of kilometers per second.
The exact value of Hubble's Constant is still a topic of debate among scientists, but the most commonly accepted value as of 2021 is around 70 km/s/Mpc. However, there have been recent studies that suggest a higher value of around 73-74 km/s/Mpc, which is still being studied and debated by the scientific community.