Curious Kids^[1] is a series for children of all ages. If you have a question you’d like an expert to answer, send it to This email address is being protected from spambots. You need JavaScript enabled to view it.^[2]. What is the universe expanding into if it’s already infinite? – Mael, age 10, Missoula, Montana When you bake a loaf of bread or a batch of muffins, you put the dough into

Leaders of NASA sit in an awkward position. While they are the head of a widely recognized organization, they’re often not the most famous individual in the agency. More people probably know the names of Butch Wilmore and Suni Williams, the astronauts currently “stranded” on the International Space Station^[1], than Bill Nelson, the...

We have only one example of biology forming in the universe – life on Earth. But what if life can form in other ways? How do you look for alien life when you don’t know what alien life might look like^[1]?

These questions are preoccupying astrobiologists^[2], who are scientists who look for life beyond Earth. Astrobiologists have...