Which is the nearest planet to the Earth?

Appeared in: SGPGI Nursing Officer-2022

Explanation

Venus is the correct answer as its orbit brings it closer to Earth than any other planet in our solar system.
At its closest approach, Venus can be as near as 38 million kilometers (approximately 24 million miles) to Earth.
This proximity is due to the respective orbital paths of Venus and Earth around the Sun.
Venus is often referred to as Earth's 'sister planet' due to their similar size, mass, and composition, but it has a much harsher environment.

Option A: Mars is Earth's outer neighbor, but its closest approach to Earth (about 54.6 million km) is significantly farther than Venus's closest approach.
Option C: Although Mercury is the closest planet to the Sun, its orbit keeps it farther from Earth than Venus. Its closest approach to Earth is about 77 million km.
Option D: The Moon is Earth's natural satellite, not a planet. A planet must orbit the sun directly, be massive enough to be rounded by its own gravity, and have cleared its neighboring region of other objects.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Planetary proximity to Earth as background academic context rather than a clinical decision trigger.
This question tests general knowledge, which is a component of some nursing entrance exams to ensure candidates have a broad educational foundation beyond core science subjects.
Understanding basic scientific facts demonstrates analytical and recall skills that are valuable in the nursing profession.
What if the question asked which planet is, on average, the closest to Earth? Recent computer simulations suggest that Mercury is, on average, the closest planet to Earth over long periods. This is because as all planets orbit the sun, Venus and Mars spend a lot of time on the opposite side of the sun from Earth, making them very distant. Mercury's tight orbit keeps its average distance to all other planets, including Earth, the lowest. This highlights the difference between 'closest approach' and 'closest on average'.

How to Approach the Question

First, carefully read the question to identify the key requirement: 'nearest planet' to 'Earth'.
Analyze the given options. Identify that Mars, Venus, and Mercury are planets, while the Moon is a satellite.
Immediately eliminate the Moon as it does not fit the definition of a 'planet'.
Recall the order of the planets from the Sun: Mercury, Venus, Earth, Mars. Earth's immediate neighbors are Venus (inward orbit) and Mars (outward orbit).
Access your knowledge about planetary orbits. Although both are neighbors, Venus's orbital path allows it to come much closer to Earth than Mars ever does.
Select Venus as the planet with the closest approach to Earth.

Concept Tested & Keywords

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Attempt every question from this paper in a timed mock, then review the full solution for each one.