According to astronomers, how many galaxies are distributed across the observable universe?(1 point)
Responses
50
50
several thousand
several thousand
100 billion
100 billion
1 trillion
100 billion
According to astronomers, there are approximately 100 billion galaxies distributed across the observable universe.
According to astronomers, there are approximately 100 billion galaxies distributed across the observable universe.
To arrive at this answer, astronomers use a combination of observation and mathematical modeling. The observable universe refers to the portion of the universe that we can see from Earth. It is estimated to have a radius of about 46 billion light-years.
To determine the number of galaxies, astronomers typically use deep-field observations. These involve pointing a telescope at a small patch of the sky for an extended period of time, allowing faint and distant objects to become visible. By counting and studying the galaxies within these observations, scientists can make statistical extrapolations to estimate the total number of galaxies in the observable universe.
Over the years, observations from various telescopes and surveys, such as the Hubble Space Telescope and the Sloan Digital Sky Survey, have contributed to refining our understanding of the universe's structure and the number of galaxies it contains. Although the exact number may vary slightly based on the specific study and the techniques used, the current consensus is that there are around 100 billion galaxies in the observable universe.