lightyear.
speed of light is constant velocity and does not accelerate so there is no g force
The standard unit for the speed of light is meters per second (m/s). In the field of physics, the speed of light is defined as the constant speed at which light travels in a vacuum, which is approximately 299,792,458 meters per second.
The speed of light is equal to 1 unit of c, where c is the speed of light in a vacuum, approximately 299,792 kilometers per second.
Speed of light
While it is truly an unconventional (and not very useful) unit, yes it is. Speed (and velocity) are shown as a ratio of elapsed distance to time. Therefore, since a light-year is a measure of distance and a century is a unit of time, this is a unit of speed (or it could be used to measure velocity).
Do you mean a light SPEED ship? Ignoring the possiblity of "warp" technology, which, though potentially faster than light, does not really address the problem of achieving light speed, but circumvents it: As speed increases, so does mass. The increase in mass is imperceptible at the speeds you and I commonly travel, and even at the enormous speeds (but still nowhere near light-speed) achieved by the space shuttle. However, at speeds near light speed, mass increases assymptotically. At light speed, mass is, in fact, infinite. If a ship was attempting to attain light speed, its mass would increase more and more with each additional unit of speed. As it gets closer to light speed, the mass would be so great that no amount of thrust would be able to get it TO light-speed. The mathematical proof of this is somewhat more complicated, but take my word for it - it's impossible.
You cannot 'measure' light. However, there is the light-year, a measurement of the distance light can travel in one year. there are many. Lumens, cadlepower, foot candles and candelas. There are probably a few more.
The speed of light, abbreviated as "c", is a fundamental constant. It is 299,792,458 meters per second, and the length of the meter is DEFINED AS being 1/299,792,458th of the distance that light travels in one second. So it is a "basic unit". We generally use 300,000 km/second or 186,000 miles per second as "close enough" approximations of the speed of light.
Hz (hertz) is a unit of frequency, not of speed.
A light-year is a unit of distance, not a unit of time.
No; the metre is a unit of length. The appropriate unit for speed would be metres per second, ms-1.
A unit that is commonly used in astronomy is the light-year - the distance light travels in a year.