Astronomy

Jupiter is often called the 'bodyguard of the Earth' because its strong gravity helps protect the inner planets by attracting or deflecting comets and asteroids that might otherwise impact Earth.

Nicolaus Copernicus is considered the 'Father of Modern Astronomy' because he formulated the heliocentric model of the solar system, which was a major shift from the geocentric model. Galileo contributed significantly to astronomy but is not typically called the 'Father of Astronomy.'

A light year is the distance light travels in one year, approximately 9.46 trillion kilometers (9.46 x 10^12 km). The options given are incorrectly formatted and do not represent this value accurately, so 'None of these' is the correct choice.

The Big Bang theory is the widely accepted explanation for the origin of the Universe, describing an explosion approximately 13.8 billion years ago that led to its expansion. This matches the question's description closely, making option C correct.

The question likely contains a typographical error referring to 'Green Red Spots.' The well-known and scientifically documented feature is Jupiter's 'Great Red Spot,' a giant, persistent storm visible as a reddish oval on Jupiter. There is no recognized 'Green Red Spot' on any planet. Jupiter's Great Red Spot is the most famous colored spot on a planet, making option B (Jupiter) the correct answer. Other planets do not have a feature known as the 'Green Red Spot.'

Jupiter is the largest planet in our solar system, significantly bigger than Venus, Mars, or Mercury. It is a gas giant with a diameter of about 139,820 km, making it the biggest planet.

Saturn is the least dense planet in the Solar System, with a density lower than water, which means it would float if placed in a large enough body of water. This makes option C correct.

Mercury and Venus are the two planets that lie between the Sun and the Earth in the solar system. Mars is located beyond Earth, so options including Mars are incorrect.

Earth is the fifth largest planet in the solar system by size. The four planets larger than Earth are Jupiter, Saturn, Uranus, and Neptune. Earth is larger than Venus, Mars, and Mercury. Therefore, the correct rank of Earth in terms of size is fifth, which corresponds to option C.

Earth is known as the watery planet because it has abundant liquid water covering about 71% of its surface, which is essential for supporting life.