Usually in kilometers. Larger objects, such as galaxies, may be measured in light-years, or in parsec.
Percent of an objects mass is expressed in terms of its weight. Percent of an objects volume is expressed in terms of its size.
Protoplanets are very small planets, about the size of a moon. Astronomers believe these celestial objects are formed during the creation of a solar system.
Depending on what is being measured, the size of a cup can vary. In terms of liquids, 1 cup is equal to 8 ounces of liquid.
The size of a hurricane is how big it is, usually measured by the size of the area that has gale for winds or stronger winds, called the gale diameter. The strength of a hurricane is independent of size and is usually measured in terms of maximum sustained wind speed.
Milky way
The answer depends on whether the city is defined in terms of its metropolitan area or its urban area, and also whether size is measured in terms of area or population. On a comparison of metropolitan areas by populations, Los Angeles is around 17th in the World.
The size of the Earth is measure in parameters generally, and it is estimated and believed to be measured at around over 40,000km in circumference, and over 500 million km squared in terms of surface area.
The size of constellation is measured in terms of the area - in square degrees - which the constellation covers. They range in size from Crux which covers 68 square degrees (0.05% of the sky) to Hydra, which covers 1300 square degrees (1.0%).
Size is in terms of diameter which is measured as miles and not square miles. Mars has a diameter of about 4,222 miles whereas Earth has a diameter of 7962 miles .
the satellites with us are made up of high technology which can calculate the sizes of large objects , these satellites measured the size of our sun and reported it to us by signals
list celestial bodies from smallest to largest star asteroid planet meteroid galaxy
Cell size is measured in nanometers (nm) using a calibrated scale on the microscope objective.