Speed of light = 299,792,458 m / s. You want to know how far away the stars must be to be able to see them in 6,000 years and 4.5 billion years. If it took light one year to hit our earth from a distant star, it would be 9.5 x 10^15 meters away. Since there are 31,536,000 seconds in one year. If it took the light 6,000 years it would be 5.7x10^19 meters away. (3x10^8 m/s)(31,536,000 s) = 9.5x10^15 meters (3x10^8 m/s)(31,536,000 s)(6,000) = 5.7x10^19 meters Now you tell me how a scientists is going to measure how far a certain star is away if the light takes 6,000 years to travel 5.7 x 10^19 meters. But some how they claim certain stars are 4.3 x 10^25 meters away to prove that the earth is 4.5 billion years old. (3x10^8 m/s)x(60 s/min)x(60 min/hr)x(24 hr/day)x(365 days/yr)x(4,500,000,000 years) = 4.3 x 10^25 meters or 4,300,000,000,000,000,000,000,000 kilometers There is no way scientists can measure that distance, ever. And if they could it would take them at the very least 4.5 billion years to measure it since light is the fastest constant. The light debate is flawed with circular reasoning. Some claim the earth is 4.5 billion years old because light from distance stars are reaching us that are too far away to be reaching us in 6,000 years. Then they go on to say that these stars are this far away because the earth is 4.5 billion years old.