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Origin of the Earth: Nebular Hypothesis Theory Video Lecture | Geography Class 11 - Humanities/Arts

FAQs on Origin of the Earth: Nebular Hypothesis Theory Video Lecture - Geography Class 11 - Humanities/Arts

1. What is the Nebular Hypothesis Theory?

Ans. The Nebular Hypothesis Theory is a scientific explanation for the origin of the Earth and the solar system. According to this theory, about 4.6 billion years ago, a giant cloud of gas and dust called a nebula collapsed under its own gravity, forming a spinning disk. The central part of the disk eventually became the Sun, while the surrounding material coalesced to form planets, including Earth.

2. How does the Nebular Hypothesis Theory explain the formation of the Earth?

Ans. According to the Nebular Hypothesis Theory, as the nebula collapsed and the spinning disk formed, small dust particles began to collide and stick together, forming larger and larger objects called planetesimals. These planetesimals eventually collided and merged to form protoplanets, which then continued to grow through more collisions and gravitational attraction. Eventually, one of these protoplanets became Earth.

3. What evidence supports the Nebular Hypothesis Theory?

Ans. There are several lines of evidence that support the Nebular Hypothesis Theory. One piece of evidence is the composition of the solar system, which shows a clear pattern of decreasing density with increasing distance from the Sun, consistent with the idea that lighter elements would be pushed farther away during the formation process. Additionally, the discovery of exoplanets (planets outside our solar system) has provided further support, as many of these exoplanetary systems show similarities to our own, suggesting a common formation process.

4. Are there any alternative theories to the Nebular Hypothesis Theory?

Ans. Yes, there are alternative theories to the Nebular Hypothesis Theory. One such theory is the Capture Theory, which suggests that the Sun captured material from a passing star, leading to the formation of the planets. Another alternative is the Tidal Theory, which proposes that the Sun's gravitational tidal forces caused material to gather and form the planets. However, the Nebular Hypothesis Theory is currently the most widely accepted explanation due to the substantial evidence supporting it.

5. How does the Nebular Hypothesis Theory explain the diversity of planets in our solar system?

Ans. The Nebular Hypothesis Theory explains the diversity of planets in our solar system by proposing that different factors, such as distance from the Sun and composition of the initial nebula, influenced the formation and composition of each planet. The inner planets, including Earth, formed closer to the Sun where it was hotter, causing volatile substances to evaporate and leaving behind rocky materials. In contrast, the outer planets formed farther from the Sun where it was colder, allowing volatile substances to remain and leading to the formation of gas giants like Jupiter and Saturn.

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Sep 03, 2025 Last updated

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