The astronomical unit (AU) is a unit of length, roughly the distance from the Earth to the Sun.

The astronomical unit (AU) is a unit of length, roughly the distance from the Earth to Mars.

The distance light travels in a year

a unit of astronomical distance equivalent to the distance that light travels in two years, which is 9.4607 × 1012 km (nearly 6 trillion miles)

Scientific notation is a mathematical expression used to represent a decimal number between 1 and 10 multiplied by ten, so you can write large numbers using less digits.

Scientific notation is a mathematical expression used to represent a decimal number between 1 and 100 multiplied by ten, so you can write large numbers using less digits.

the position or direction of an object appears to differ when viewed from different positions, e.g., through the viewfinder and the lens of a camera.

the position or direction of an object appears to stay the same when viewed from different positions, e.g., through the viewfinder and the lens of a camera.

Uses simple geometry to determine distance in space by using a baseline and two angles

Uses complex geometry to determine distance in space by using a baseline and three angles