Explanation

• The Earth takes approximately 23 hours, 56 minutes, and 4.9 seconds to complete one rotation on its axis,
• It is called a sidereal day.
• This is the time it takes for the Earth to rotate once relative to the fixed stars.
• The extra 4 minutes is due to the Earth's slightly ellipsoidal shape and the effects of the Moon's gravitational pull.

Explanation

A galaxy is a gravitational system of stars, star remnants, interstellar gas, dust, and dark matter.

Earth: diameter of approximately 12,742 kilometers (7,918 miles)

The Sun: diameter of approximately 1,392,684 kilometers (865,374 miles)

Solar System: diameter of approximately 9.2 billion kilometers (5.7 billion miles)

Galaxy (Milky Way): diameter of approximately 100,000 to 200,000 light-years (9.461 × 10^17 to 1.884 × 10^18 kilometers)

Explanation

Explanation

• It takes Mercury approximately 88 Earth days (specifically 87.97 days) to complete one orbit around the Sun
• This means that Mercury's year is equal to 88 Earth days
• Distance: Approx. 58 million km from the Sun
• But its rotation takes nearly 59 days. 
• Speed: ~47 km/s

Last updated question 2 May 2026 by NS

Explanation

Near Earth's surface, the acceleration due to gravity is 9.8 m/s2 (32 ft/s2).

This means that, ignoring the effects of air resistance,

the speed of an object falling freely will increase by about 9.8 meters per second (32 ft/s) every second.

Explanation

An earthquake (also known as a quake, tremor or temblor)

Earthquake means shaking of the earth.

An earthquake is a natural event.

Earthquakes are caused due to: Movement of a part of the earth's surface on account of the faulting of rocks

Explanation

A celestial body that revolves around a planet is known as a satellite

Which can be natural (like the Moon) or artificial (like the International Space Station).

A celestial body that revolves around a planet is known as a moon.

Moons are natural satellites orbiting planets and can vary in size and composition.

Explanation

Venus is known as Earth's sister planet because both planets are a lot similar to each other.

Mars is called the brother of the Earth.

Explanation

• Stars generate their own light through nuclear fusion in their cores.
• It making them self-luminous.

Explanation

1. Mercury

Swift Planet for Mercury

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2. Venus

Eight planets in the solar system