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Astronomical Unit


An astronomical unit (AU) is a unit of distance used in astronomy to describe the average distance between the Earth and the Sun. It equals about 149.6 million kilometers (or about 93 million miles). The AU is useful for measuring distances within our solar system, such as the distance from Earth to other planets. For example, Mars is about 1.5 AU from the Sun. Using the AU makes it easier to understand and compare distances between planets without dealing with very large numbers. The symbol for astronomical unit is "AU".


Ångström


An ångström (symbol: Å) is a unit of length commonly used in physics, chemistry, and biology to measure very small distances, such as atomic and molecular scales. It is equal to 10⁻¹⁰ meters, or 0.1 nanometers (nm).


The unit is named after the Swedish physicist Anders Jonas Ångström, who made significant contributions to spectroscopy.


Key facts:



  • 1 ångström = 10⁻¹⁰ meters = 0.1 nanometers



  • Used to measure atomic and molecular sizes, wavelengths of light, and crystal lattice constants



  • Common in fields like crystallography, chemistry, and materials science



Though largely replaced by the nanometer in the SI system, the ångström remains widely used in scientific literature to describe very small lengths.




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