Proxima Centauri is the closest star to Earth after the sun and it is 4×1013  km4×10 13   km away! We can calculate how long it takes light to travel from this star to earth by dividing its distance from earth by the speed that light travels, which is 1×109  km/hr1×10 9   km/hr.  Evaluate the expression below using index notation to determine how long it takes light from Proxima Centauri to reach Earth in hours. 4×10131×1091×10 9 4×10 13 ​  Remember to include units with your answer.

How far away (in ly) is the star closest to the Sun? lyWhat is its name?PolarisProxima Centauri    SiriusTau Ceti

Light from the sun reaches the Earth in 8.3 minutes. The velocity or the speed of light is 3.00 x 108 m/s. How far is the Earth from the sun? Answer in both meters and miles. (1 mile = 1,609 meters)

A star has a parallax of .05", its distance is Group of answer choices5 light years.20 parsecs.200 parsecs.660 light years.

The distance from the Sun to Earth is 150 000 000 kilometres.Sunlight travels at a speed of 300 000 kilometres per second.How long does it take sunlight to travel from the Sun to Earth?

The speed of light is about 3×1083×10 8 m/s.  It takes approximately 1.3 seconds for sunlight reflected from the moon to reach Earth. What is the distance from Earth to the moon?