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Geography

Star formation, formation of planets, and our solar system

In this Class 11 Geography topic from “The Origin and Evolution of the Earth,” students explore how stars form from vast clouds of gas and dust and how planets emerge from the material surrounding a young star. They examine the formation and organisation of the solar system, including the Sun, planets, satellites, asteroids and comets, while connecting these processes with Earth’s place, structure and early development within the wider universe.

Expert · Level 3 · 25 questions

TOPIC PRACTICE

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  1. Gravitational interaction between large planets and small bodies
  2. Present seasons of Earth
  3. Formation of a solid crust on the Sun
  4. The Moon becoming a star by itself
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  1. When cloud temperature becomes too high and stops contraction
  2. When gravitational attraction exceeds internal pressure and contracts the cloud
  3. When planetesimals directly become stars
  4. When solar wind completely empties the cloud
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  1. They help radiate energy away and cool the cloud
  2. They remove gravity
  3. They immediately turn planets into the Sun
  4. They only increase light and prevent contraction
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  1. It organizes material around the protostar and feeds it inward
  2. It pushes planets away from stars
  3. It reduces the age of the solar system
  4. It makes the Moon a terrestrial planet
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  1. Rotation and accretion are active near the young star
  2. The star is completely dead
  3. Planetary orbits have ended
  4. The Sun's surface has become solid
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  1. High temperature resistant metallic and silicate materials
  2. Only liquid water
  3. Fully developed vegetation
  4. Large mountains of sea salt
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  1. It shows which materials become solid at different temperatures and locations
  2. It makes all planets identical
  3. It makes the Sun smaller than planets
  4. It makes orbits square
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  1. High temperature and solar wind due to closeness to the Sun
  2. Small size of outer planets
  3. Absence of comets on Earth
  4. Very large mass of the Moon
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  1. Rapid growth of solid cores of giant planets
  2. Formation of Mercury's atmosphere
  3. Cooling of the Sun
  4. End of Earth's rotation
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  1. Joining tiny dust grains into small clumps
  2. Ending the Sun's mass
  3. Turning gas giants into stars
  4. Cutting the galaxy into two parts
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  1. Larger bodies attract smaller bodies more effectively by their gravity
  2. Small bodies completely stop gravity
  3. All bodies remain of equal size
  4. Planets form only from light
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  1. Large cores needed time to collect gaseous envelopes
  2. The gas disk had no relation with planets
  3. Gas dispersal always increases rocks
  4. The Sun immediately goes out
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  1. Gravitational interaction with the gas disk and other bodies
  2. Present human made satellites
  3. Earth's seasons
  4. Color of sea waves
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  1. Repeated gravitational pulls can destabilize or organize some orbits
  2. It switches off sunlight
  3. It makes planetary mass zero
  4. It makes oceans solid
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  1. Orbital resonance with Jupiter
  2. Rainfall on Earth
  3. Greenhouse effect of Venus
  4. Color of the Moon's surface
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  1. Some small bodies can remain in stable gravitational regions with planets
  2. All asteroids are inside the Sun
  3. Asteroids have no gravitational relation
  4. They formed from Earth's oceans
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  1. It helped melt internal materials and allowed density separation
  2. It stopped revolution around the Sun
  3. It made Earth a gas giant
  4. It immediately formed oceans
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  1. Rapid sinking of iron toward the center in molten Earth
  2. Sudden formation of oceans
  3. Rise of oxygen in the atmosphere
  4. Earth separating from the Sun
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  1. It helps explain the giant impact model of the Earth Moon system
  2. It proves that the Moon is a star
  3. It shows that the Sun is solid
  4. It shows Earth came from Jupiter
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  1. Supply of internal gases and water vapor
  2. Formation of the solar nebula
  3. Formation of Jupiter's rings
  4. Complete destruction of comets
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  1. It made condensation of water vapor possible
  2. It made the Sun solid
  3. It ended gravity
  4. It made Jupiter smaller
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  1. Atmosphere before widespread development of photosynthetic organisms
  2. Absence of the Sun
  3. Gravity free Earth
  4. Ice giant planets
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  1. They can preserve ancient and less altered solar material
  2. They are made only by modern factories
  3. They come directly from the present core of the Sun
  4. They are living satellites
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  1. Decay of radioactive elements can reveal the age of old solids
  2. It tells the color of planets
  3. It only tells weather
  4. It makes the Sun smaller
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  1. They are counted among the oldest solid solar materials
  2. They form from present clouds of Earth
  3. They are found only in oceans
  4. They are fossil plants

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