Q5. सौर्यमण्डल/सौर्य प्रणालीमा भित्री ग्रह (Terrestrial Planet पनि भनिन्छ ) भनेर चिनिने चार ग्रहहरू कुन-कुन हुन् ? (नायब सुब्बा, २०७१ / खरिदार,२०८०)
A
बुध, शुक्र, पृथ्वी र बृहस्पति
B
बुध, शुक्र, पृथ्वी र मंगल
C
बुध, शुक्र, शनि र बृहस्पति
D
बुध, पृथ्वी, शनि र मंगल
Q5. सौर्यमण्डल/सौर्य प्रणालीमा भित्री ग्रह (Terrestrial Planet पनि भनिन्छ ) भनेर चिनिने चार ग्रहहरू कुन-कुन हुन् ? (नायब सुब्बा, २०७१ / खरिदार,२०८०)
Ans: A
Explanation:
Terrestrial planets are rocky, inner planets with solid surfaces, like Mercury, Venus, Earth, and Mars, characterized by a metallic core, a silicate mantle, and landforms such as mountains, valleys, and craters.
Key Characteristics of Terrestrial Planets:
Composition: Primarily composed of silicate rocks and metals, with a central metallic core (mostly iron) and a surrounding silicate mantle.
Surface Features: Have diverse surface features like mountains, valleys, canyons, craters, and volcanoes.
Atmosphere: Have secondary atmospheres, meaning their atmospheres are not primary and were generated through volcanism or comet impacts.
Moons: Generally have few or no moons.
Location: In our solar system, the terrestrial planets are the four innermost planets: Mercury, Venus, Earth, and Mars.
Density: Terrestrial planets have densities greater than 3 grams per cubic cm.
Examples of Terrestrial Planets in our Solar System:
Mercury: The smallest planet and nearest to the Sun, with a heavily cratered surface and a thin atmosphere.
Venus: The second planet from the Sun, known for its dense, toxic atmosphere and extremely hot surface.
Earth: Our home planet, the only known planet to harbour life, with a diverse ecosystem and a significant atmosphere.
Mars: The fourth planet from the Sun, known for its reddish appearance and potential for past or future life.