Explanation

• Battery is a device that converts chemical energy into electrical energy.
• Batteries work by using a galvanic cell.
• It is an electrochemical device made up of two electrodes and an electrolyte solution.

Last verified on 16-03-2026

Explanation

• The Earth’s circumference at the equator is about 40,075 km (24,901 miles).
• Measured through the poles, it is slightly smaller: 40,008 km (24,860 miles).
• The difference is due to the equatorial bulge caused by Earth's rotation.
• Diameter: ~12,756 km (7,926 miles).
• Age of Earth: ~4.453 billion years.

Last verified on 31-03-2026

Explanation

• The largest planet in our solar system is Jupiter.
• 5th planet
• 79 known moons (Maximum number of moons)
• The Great Red Spot is a prominent feature
• Giant planet and the fastest-rotating planet 
• Rotates approximately once every 10 hours.
• Age is about 4.603 billion years.

Additional information

• Mercury is the smallest planet of the solar system.

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Last updated by NA on 25-April-2026

Explanation

• Satellites and the Moon move in an elliptical orbit around Earth.
• Their distance from Earth changes at different points in the orbit.
• The farthest point from Earth is given a special scientific name called apogee.
• The closest point has a different name called perigee.

Last verified on 31-05-2026

Explanation

• Earth moves around the Sun in an elliptical orbit.
• Because of this, the distance between Earth and Sun changes during the year.
• The point where Earth is closest to the Sun is called perihelion.
• This occurs in early January every year.

Last verified on 31-05-2026