Jupiter ; Red : : __________ : Blue

The given analogy is asking for the word that is related to "Red" in the same way "Jupiter" is related to the word in the blank space. Let's analyze the relationship between "Jupiter" and "Red" first.

Jupiter is a planet in our solar system, and it is commonly associated with the color "Red." However, it is important to note that Jupiter is not actually red. The reason for this association is because of the prominent red spot on Jupiter's surface, which is a massive storm. This storm is often referred to as the "Great Red Spot" and is a defining feature of the planet.

Now that we have understood the relationship between "Jupiter" and "Red," let's look at the answer choices:

a) Earth
b) Mars
c) Mercury
d) Uranus

To find the correct answer, we need to determine which of these options has a similar relationship to "Blue" as "Jupiter" has to "Red."

The correct answer is option 'A' - Earth. Here's why:

Jupiter is associated with the color "Red" because of the Great Red Spot on its surface. Similarly, Earth is associated with the color "Blue" because of its vast oceans. The Earth is often referred to as the "Blue Planet" because about 71% of its surface is covered by water.

So, just as Jupiter is related to the color "Red" due to the Great Red Spot, Earth is related to the color "Blue" due to its oceans. Therefore, the correct answer is option 'A' - Earth.

In summary:
- Jupiter is associated with the color "Red" due to the Great Red Spot on its surface.
- Earth is associated with the color "Blue" because of its oceans.
- Therefore, the correct answer to the analogy is option 'A' - Earth.