Light-second facts for kids
A light-second is a unit of length equal to the distance light in empty space travels in one second, and is exactly 299,792,458 meters.
The light-second is used in telecommunications, astronomy, and physics. In telecommunications, it measures how much time it must take to send a signal a certain distance.
Images for kids
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The yellow shell indicating one light-day distance from the Sun compares in size with the positions of Voyager 1 and Pioneer 10 (red and green arrows respectively). It is larger than the heliosphere's termination shock (blue shell) but smaller than Comet Hale-Bopp's orbit (faint orange ellipse below). Click on the image for a larger view and links to other scales.
See also
In Spanish: Segundo luz para niños
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Light-second Facts for Kids. Kiddle Encyclopedia.