Why are light-years used to measure distances in space? O The speed of light is slower in space. O The speed of light is faster than time. O Distances in space constantly change. Distances between stars are very large.

Why are light-years used to measure distances in space? O The speed of light is slower in space. O The speed of light is faster than time. O Distances in space constantly change. Distances between stars are very large.

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter19: Celestial Distances

Section: Chapter Questions

Problem 6E: The meter was redefined as a reference to Earth, then to krypton, and finally to the speed of light....

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Concept explainers

Frame of reference

In physics, a frame of reference is a coordinate system used to specify either the position or the orientation or velocity of a body. The origin of the coordinate acts as a reference point for measuring the position or relative motion of a body. The coordinate system can be a cartesian coordinate, cylindrical coordinate, or a polar coordinate.

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Why are light-years used to measure distances in space?
O The speed of light is slower in space.
O The speed of light is faster than time.
O Distances in space constantly change.
O Distances between stars are very large.

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Im sorry but i cant understand this One light year =distance travelled by light in a year 1 ly=C(1 year) d= 12ly =12c years time taken by Fred and George with respect to observer on Earth are t1=dv1=12 c0.9 c=13.33 yrt2 =dv2=12 c0.5 c=24 yr Actual times are t0=t11-v1c2=5.81 yrt0=t21-v2c2=20.78 yr
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