All questions of Beyond Earth for Class 6 Exam

Option B, Revolution

Stars emit their own light through nuclear fusion, while planets do not emit their own light and only reflect the Sun's light.

Identifying Orion
Orion is one of the most recognizable constellations in the night sky, particularly famous for its distinctive pattern.
Orion's Belt
- Orion’s Belt consists of three bright stars: Alnitak, Alnilam, and Mintaka.
- These stars are aligned in a straight line, making them easily identifiable.
Location and Visibility
- Orion is best visible during winter in the Northern Hemisphere and summer in the Southern Hemisphere.
- The constellation is located on the celestial equator, making it visible worldwide.
Other Features of Orion
- Orion is often depicted as a hunter in mythology, holding a bow and arrow.
- In addition to Orion's Belt, the constellation also contains other notable stars and features, such as Betelgeuse (a red supergiant) and Rigel (a blue supergiant).
Why Not Other Options?
- Ursa Major: Known for the Big Dipper, not aligned like Orion's Belt.
- Ursa Minor: Home to Polaris, the North Star, but lacks a prominent belt structure.
- Cassiopeia: Recognized for its W shape, not a series of bright stars in a row.
Conclusion
In summary, Orion is the correct answer because it is defined by the easily recognizable three stars in a row known as Orion's Belt, distinguishing it from other constellations.

Understanding the Water Cycle
The phenomenon driven by the Sun that involves the continuous movement of water on, above, and below the surface of the Earth is known as the water cycle.
Key Stages of the Water Cycle:
- Evaporation:
- Water from oceans, rivers, and lakes heats up due to the Sun's energy and transforms into water vapor, rising into the atmosphere.
- Condensation:
- As the water vapor rises, it cools and condenses to form clouds. This process is crucial for the formation of precipitation.
- Precipitation:
- When the clouds become heavy with water droplets, they release this water back to the Earth in the form of rain, snow, sleet, or hail.
- Collection:
- The precipitation collects in bodies of water like rivers, lakes, and oceans, where the cycle begins anew. Some water also seeps into the ground, replenishing groundwater supplies.
Importance of the Water Cycle:
- Supports Life:
- The water cycle is essential for all living organisms. It provides fresh water for drinking, agriculture, and sanitation.
- Climate Regulation:
- It plays a crucial role in regulating the Earth's climate by distributing heat and moisture around the planet.
- Ecosystem Balance:
- The cycle maintains the balance of ecosystems by ensuring that plants and animals have access to water.
In summary, the water cycle is a vital system driven by solar energy, ensuring the continuous movement and recycling of water, supporting life, and regulating climate.

Comets are composed of dust, ice, and gases, and form a glowing coma and tail when they approach the Sun.

Excessive artificial light from urban areas causes light pollution, making it difficult to see stars.

Our Solar System is located in the Milky Way Galaxy.