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Centimeter

A centimeter (cm) is a unit of length in the metric system. It is commonly used to measure small objects or short distances. One centimeter is equal to one-hundredth of a meter, meaning 100 centimeters make 1 meter. In everyday life, centimeters are used to measure height, the size of books, or dimensions of furniture. For example, a pencil might be about 15 cm long. The symbol for centimeter is "cm", and it is widely used around the world, especially in countries that follow the metric system. Rulers and measuring tapes often include centimeter markings to help with precise measurements. The centimeter is a practical and easy-to-use unit that helps in getting accurate sizes for various items.

Gigameter

A gigameter (Gm) is a unit of length in the metric system, equal to 1 billion meters (1 Gm = 10⁹ meters). Gigameters are used to measure very large distances, often within the solar system. For example, the average distance from Earth to the Sun is about 150 gigameters, or 1 astronomical unit (AU). While not commonly used in everyday life, gigameters are helpful in astronomy and space science to describe distances between planets or other celestial bodies.