28 billion years
Distance at galactic scales is usually measured in terms of lightyears. Distance at cosmological scales may also be put in terms of Hubble red-shift factors.
Speed is a rate often measured in kilometers per hour.
In the SI system the radiation constant (Stefan-Boltzmann constant) is measured in W/m2.K4.
Mass is not measured in kilometres.
i think it is speed
Lightyears. The distance between the Sun and Earth is 1.49 lightyears (149 000 000 km)
Cavendish measured the gravitational constant "G".
Interplanetary distances are measured in either kilometers or in miles. For the distant planets, some measures are measured in Astronomical Units, where one AU is the distance between the Sun and the Earth. So, 1 AU = 93,000,000 miles.
Distance at galactic scales is usually measured in terms of lightyears. Distance at cosmological scales may also be put in terms of Hubble red-shift factors.
Bigger objects like celestial bodies ,Earth ,sun their radius are measured in kilometers .
Speed is a rate often measured in kilometers per hour.
The density of an object is measured in kilograms and kilometers.
Velocity is measured in meters/second in the S.I. system.
Distance.
42,195km
24.31 kilometers = 2,431,000 centimeters
A 26.2-mile marathon is 42.16 kilometers.