As evidence supporting the Big Bang theory, what does the redshift of light from galaxies indicate?(1 point) Responses The universe is mainly hydrogen. The universe is mainly hydrogen. The universe is cooling off. The universe is cooling off. The universe is expanding. The universe is expanding. The universe is 13.8 billion years old.
The redshift of light from galaxies indicates that the universe is expanding.
The redshift of light from galaxies indicates that the universe is expanding.
The redshift of light from galaxies indicates that the universe is expanding. To understand this, we need to look at the concept of redshift. When an object is moving away from an observer, the light waves emitted by that object get stretched, causing them to shift towards the red end of the electromagnetic spectrum. This phenomenon is known as redshift.
In the case of galaxies, astronomers have observed that the light emitted by distant galaxies is redshifted, which means that these galaxies are moving away from us. The greater the redshift, the faster the galaxy is moving away. This observation led to the discovery of the expanding universe, which is a key piece of evidence supporting the Big Bang theory.
The Big Bang theory states that the universe began with a tremendous explosion from a highly compact and dense state. As a result, all matter and energy started expanding and moving away from a central point. The redshift of light from galaxies is consistent with this expansion, as it indicates that the universe is not static but rather getting larger and therefore supports the idea of a Big Bang. Hence, the correct answer is: "The universe is expanding."