Hello, I’m Catalina

I live in a small town in the Atacama desert in Chile, where the sky is dark enough to see the Milky Way cast a shadow. I taught physics at a secondary school for twelve years, and now I give night sky talks for visitors.

On those nights the same question keeps coming: how do we know? How do we know how far away a star is, or what it is made of? So I started a weekly letter. Each one explains a single discovery and names the earlier steps it stood on.

I write plainly and I show my sources. I make printable sheets for teachers and curious readers, and two short video courses for anyone who wants the whole story in order.