Once in a lifetime. I feel like people say that too much that it doesn't have quite the punch it should. The Transit of Venus is one such example. This once in a lifetime opportunity actually happened 8 years ago but won't happen for another 105 years. I wonder if they called it a once in a lifetime chance 8 years ago. Probably. This picture is a reflection from the telescope. The big circle is the sun, and the little black dot on the lower part is Venus. Is it really that cool? I'm not sure.