The Ohio State University Planetarium Posts - TopicsExpress

We have a couple of methods to determine the age of our solar
We have a couple of methods to determine the age of our solar system. One is measuring the decay of radioactive elements in unmelted meteorites. The s...

Were often asked the question How many galaxies ARE there in the
Were often asked the question How many galaxies ARE there in the universe? Lets see, shall we? The Hubble Extreme Deep Field (XDF; see article below) ...