Astronomy

Sunspots are cooler areas on the Sun's surface that appear darker than the surrounding regions because they are cooler and have intense magnetic activity. Hence, the correct answer is 'Sun Spots'.

The Earth revolves around the Sun at an average orbital speed of approximately 29.78 km/sec, which is closest to option C (29 km/sec). Options A and B are incorrect values, and D is not applicable.

Earth is called the watery planet because it has abundant liquid water covering about 71% of its surface, unlike other planets in the solar system.

Jupiter is the largest planet in our solar system, significantly bigger than Saturn, Earth, or any other planet. It has a much greater mass and volume than the others listed.

If the Earth's equatorial plane were not inclined to the plane of its orbit (the ecliptic), there would be no seasonal variation because the Sun's rays would strike the Earth uniformly throughout the year. Therefore, there would be no change of seasons.

Georges Lemaître was the Belgian priest and physicist who first proposed the idea of an expanding universe, which later became known as the Big Bang theory. The other options are unrelated to this scientific theory.

The Great Red Spot is a giant storm located on the planet Jupiter, not Saturn. It is a well-known feature of Jupiter's atmosphere.

Venus is the planet most easily visible from Earth with the naked eye due to its brightness and proximity, often called the 'Evening Star' or 'Morning Star'. Mercury is harder to see because it is closer to the Sun and appears only briefly at dawn or dusk.

According to the Big Bang Theory, the Universe began about 13.8 billion years ago, which is not within the ranges provided in options A, B, or C. Therefore, the correct answer is 'None of these'.

The Great Spot, commonly known as the Great Red Spot, is a giant storm on the planet Jupiter. It is a persistent high-pressure region producing an anticyclonic storm, making option B correct.