The frontal length.
AU(astronomical unit) is not an unit of time but distance. It is a mean distance between Earth and Sun and it's roughly equal 150 million kilometers. If you are asking for straigth line distance between Mars and Earth, it can be anything between about 0.52 AU, when the planets are closest together and 2.52 AU when they are on opposite sides of Sun.
One astronomical unit (AU) is the distance between the Earth and the Sun.
The S.I. unit of distance is the metres, which is basically the distance between any two points.
A stellar unit refers to a unit of distance used in astronomy to measure the distance between stars. It is typically equivalent to the mean distance between stars within a galaxy, which can vary depending on the galaxy being observed.
An Astronomical Unit is a unit of measurement roughly equal to the average distance between the Earth and the Sun; about 150 Million Kilometres.
The distance between the Sun and Earth is called an astronomical unit (AU).
Meters or kilometers, depending on the distance.
One Astronomical Unit is the mean distance between the Sun and the Earth.
Me, I'm torn between the Smoot and the Parsec
astronomical unit
Light Years.
The distance varies between 0.718 and 0.728 AU.