Question

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astronomer edwin hubble observed that other galaxies in our universe were moving away from our own milky way galaxy.

he proposed a scientific idea called cosmic expansion and created a mathematical formula to show the rate at which these galaxies are moving away from each other.

the most commonly accepted idea about the origins of the universe is called the big bang. this idea attempts to explain why the universe is expanding outward. the big bang states that the universe started as a single, tiny point that contained all the universe’s matter.

then, almost 14 billion years ago, a massive expansion event occurred that led to the creation of the planets, stars, solar systems, and galaxies and causes their outward movement.

these two scientific ideas are very closely related. distinguish which is a theory and which is a law. provide justification for your decision.

Explanation:

Answer:

Cosmic Expansion (Hubble's Law) is a scientific law: it is a mathematical description (Hubble’s formula \( v = H_0d \), where \( v \) is velocity, \( d \) is distance, \( H_0 \) is Hubble constant) of a consistent observed phenomenon (galaxies moving away proportionally with distance).

The Big Bang is a scientific theory: it is a well - supported explanation for the origin and expansion of the universe, attempting to explain why the universe behaves as it does (including the outward movement explained by Hubble’s Law) and is based on multiple lines of evidence (cosmic microwave background, element abundances, etc.), aiming to account for a broad set of observations about the universe’s beginnings and evolution.