List four assumptions on which science is based. Describe some limitations these assumptions impose on the kinds of questions science can address. Defend your decision. The universe and the Earth were created 6,000 to 10,000 years ago. For us to see light from an object that far away, the object must be older than 170,000 years.
Most galaxies are millions of light-years away.
The rays of light in transit from galaxies to earth were created when the galaxies were created. For example, it takes 4.5 billion years for half the 238 U in a rock to convert to 206 lead. A ratio of one 238 Uranium to three 206 lead would indicate 6.75 billion years, etc. Any calculation based on the assumption that half-life is constant will overestimate the age of the earth. Radio isotope dating is worthless.