Question

The Big Bang Theory is related to the origin of which entity?

• A. Earth
• B. Solar System
• C. Universe
• D. Milky Way Galaxy

Hint:

Remember the key idea: \textbf{Big Bang Theory} $\rightarrow$ Origin of the \textbf{Universe} Timeline to remember:

• Universe formed $\approx$ 13.8 billion years ago
• Solar System formed $\approx$ 4.6 billion years ago
• Earth formed $\approx$ 4.5 billion years ago

Answer 1

The Correct Option is C

Concept: The Big Bang Theory is the most widely accepted scientific explanation for the origin of the universe. According to this theory, the universe began approximately 13.8 billion years ago from an extremely hot and dense point called a singularity. At this moment, a massive expansion occurred, causing space, time, matter, and energy to come into existence. This expansion is known as the Big Bang. Over billions of years, this expanding universe cooled down, allowing the formation of particles, atoms, stars, galaxies, and planetary systems. The theory was first proposed by the Belgian astronomer and physicist Georges Lemaître in 1927 and later supported by several observational evidences such as cosmic microwave background radiation and the expansion of galaxies.
Step 1: Understanding what the Big Bang explains.
The Big Bang Theory explains the:

• Origin of space and time
• Formation of matter and energy
• Expansion of the universe

It does not describe the formation of only a single planet, star, or galaxy, but rather the beginning of the entire universe.
Step 2: Key evidence supporting the Big Bang Theory.
Scientists support the Big Bang Theory using several observations:

• Expansion of the Universe: Discovered by Edwin Hubble, showing that galaxies are moving away from each other.
• Cosmic Microwave Background Radiation (CMB): The faint radiation left over from the early stages of the universe.
• Abundance of Light Elements: The predicted amounts of hydrogen and helium formed shortly after the Big Bang match observations.

Step 3: Evaluating the given options.

• Earth: Formed about 4.5 billion years ago, long after the Big Bang.
• Solar System: Formed from a collapsing cloud of gas and dust.
• Universe: The Big Bang Theory explains the origin of the entire universe.
• Milky Way Galaxy: One of billions of galaxies formed after the universe began.

Therefore, the correct answer is: \[ \text{Universe} \]