UNIVERSE
COMETS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
TRUE
|
|
|
FALSE
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Comets are large objects made of dust and ice that orbit the Sun. Best known for their long, streaming tails, these ancient objects are leftovers from the formation of the solar system 4.6 billion years ago.
Detailed explanation-2: -Comets are celestial objects made of gas and dust which revolve around the Sun in a highly elliptical orbit. They are visible only when they approach closer to the Sun. The revolution period of a comet is very long.
Detailed explanation-3: -The correct statement about comets is: C. Comets are mostly made up of dust particles, frozen water and frozen gases.
Detailed explanation-4: -As of November 2021 there are 4, 584 known comets. However, this represents a very small fraction of the total potential comet population, as the reservoir of comet-like bodies in the outer Solar System (in the Oort cloud) is about one trillion.
Detailed explanation-5: -Oxygen was formed from lighter elements fusing together, hydrogen was either left over, or formed when heavier elements decayed. The hydrogen and oxygen ran into each other and formed water, in the cold of space that turned to ice. Gravity pulled the bits of ice and other stuff together, forming the comet.