According to the big bang theory, galaxies are
a. in constant motion
b. are moving away from each other
c. are moving at different speeds indifferent directions
d. are moving slower than in past times
b. are moving away from each other
According to the Big Bang theory, galaxies are:
b. moving away from each other
The theory suggests that the universe started with a massive explosion (the Big Bang) and has been expanding ever since. As a result, galaxies are continuously moving away from each other, driven by the expansion of space itself. This phenomenon is known as the "redshift," where light from distant galaxies is shifted towards longer wavelengths, indicating their motion away from us.
According to the big bang theory, galaxies are b. moving away from each other.
To understand why galaxies are moving away from each other, we need to take a step back and consider the basic principles of the big bang theory. The big bang theory suggests that the universe originated from a singularity around 13.8 billion years ago and has been expanding ever since.
Imagine a balloon being inflated: as the balloon expands, any two points marked on its surface move away from each other. The same principle applies to the universe. In the wake of the big bang, all of space and time began to expand, causing galaxies, which are large collections of stars, gas, and other celestial objects, to move away from each other.
The evidence supporting this concept comes from observations of the redshift of light from distant galaxies. Redshift refers to the stretching of light waves towards longer wavelengths, which occurs when an object is moving away from an observer. By studying the redshift of light from various galaxies, astronomers have found that most galaxies are indeed moving away from us, and from each other.
So, according to the big bang theory, galaxies are continually moving away from each other as a result of the ongoing expansion of the universe.