Olympiad Test Level 2: Our Earth and Universe- 2 - Class 6 MCQ

Celestial bodies that have their own heat and which emit light in large amount is called stars.

Eros, an Asteroid. Meteoroids are lumps of rock or iron that orbit the sun, just as planets, asteroids, and comets do. Meteoroids, especially the tiny particles called micrometeoroids, are extremely common throughout the solar system.

A. Largest Planet: Jupiter is the fifth planet from the Sun and the largest in the Solar System.
B. Brightest Planet: Venus, the second planet from the sun, is the hottest and brightest planet in the solar system.
C. Densest Planet: Earth is the densest planet in the Solar System.
D. Smallest Planet: Mercury is the smallest planet in the Solar System and the closest to the Sun.

At the equator, the rings would appear to divide the sun, casting a dramatic shadow over half the world. Likewise, the rings themselves would cast shadows on Earth.

The word Fortnight was derived from Fourteen nights and it denotes the time period of 2 weeks which includes fourteen days and nights.

• The International Astronomical Union (IAU) was founded in 1919. Its mission is to promote and safeguard the science of astronomy in all its aspects, including research, communication, education and development, through international cooperation. 
• It is a worldwide society of professional astronomers and is considered the authority for assigning names to celestial objects, whether they are planets or moons, or other types of worlds, as well as their surface features on them. The IAU collaborates with various scientific organizations all over the world.

Uranus is made of water, methane, and ammonia fluids above a small rocky center. Its atmosphere is made of hydrogen and helium like Jupiter and Saturn, but it also has methane. The methane makes Uranus blue.

• An aurora is a natural light display in the sky, particularly in the high-latitude of arctic and antarctic regions. 
• It is caused by the collision of atmospheric atoms with energetic, charged particles coming from space. 
• In northern latitudes, the effect is known as the Aurora Borealis or Northern lights; whereas in the southern latitudes it is known as Aurora Australis or Southern lights.

• A supernova is an explosion of a massive supergiant star. It may shine with a brightness of 10 billion suns. It can briefly outshine entire galaxies and radiate more energy than our sun will in its entire lifetime. They're also the primary source of heavy elements like iron in the universe. 
• According to NASA, supernovae are "the largest explosion that takes place in space.

Pumice is a type of volcanic rock, produced when lava with a very high content of water and gases is discharged from volcano. Pumice is a very light rock which is used as body scrubber and to polish floor.