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22 cze 2024 · Discover what a light year is and why it's crucial for understanding the universe. Learn how this astronomical measure is calculated and how it helps us grasp cosmic distances.
A light-year, alternatively spelled light year ( ly ), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km ( Scientific notation: 9.4607304725808 × 10 12 km), which is approximately 5.88 trillion mi.
A light-year is the distance light travels in a vacuum (empty space) in 1 year. In SI units, a light year is 9.5 × 10 15 m. The light-year is used to measure large distances, those beyond our Solar System. We generally use light-years to measure distances to other stars in our Galaxy, or even to galaxies beyond our own.
28 maj 2020 · Get the definition of a light year in astronomy. See examples of distances in light years and how the unit compares with parsecs and AU.
Learn how to derive and apply the Lorentz transformation, a key concept in special relativity, from OpenStax's University Physics Volume 3.
In physics, Maxwell's equations in curved spacetime govern the dynamics of the electromagnetic field in curved spacetime (where the metric may not be the Minkowski metric) or where one uses an arbitrary (not necessarily Cartesian) coordinate system.
Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. We use light-time to measure the vast distances of space.
