In 10 million years, will any signs of humanity remain on Earth’s surface? Nobody knows; possibly all the evidence will have been erased or buried. But there are some artifacts of our technology that should still be intact, in good condition, even in 100 million years! These are the spacecraft that we humans have launched to explore the outer reaches of the solar system.
Chicago in January may feel like the coldest place in the universe, but it’s colder at the South Pole. Scientists there are looking out into space and observing microwaves that have been traveling at the speed of light for 13.6 billion years. Once they were ultraviolet rays, but as the universe expanded, their wavelengths stretched, and they became blue, then red, then infrared (heat) and now they are microwaves, which you may have in an oven in your kitchen. Radio waves have even longer wavelengths.
“Wait,” you may be thinking, “I thought this was a science column. What has science to do with peace?” Those who visit Fermilab or CERN, the European Laboratory for Particle Physics in Switzerland, understand. There are today many international scientific organizations, at least partly inspired by CERN’s success.