“The only things our planet and Mars really have in common is that both are rocky planets with some water ice and both have robots (and Mars doesn’t even have that many),” writes Shannon Stirone for The Atlantic. “Granted, walking around on Mars would be a life-changing, amazing, profound experience,” she notes. “But visiting as a proof of technology or to expand the frontier of human possibility is very different from living there. It is not in the realm of hospitable to humans. Mars will kill you.”
On Dec. 4, 2012, the IceCube Observatory in Antarctica at the Amundsen-Scott South Pole Station, detected an event now known as Big Bird, a neutrino with an energy exceeding 2 quadrillion electron volts (PeV). To put that in perspective, it’s more than a million million times greater than the energy of a dental X-ray packed into a single particle thought to possess less than a millionth the mass of an electron. Big Bird was the highest-energy neutrino ever detected at the time.