A star-forming galaxy in the early universe might have sent a ghostly particle known as a neutrino crashing into the ice at Earth’s South Pole, after an 11 billion-year journey through space.

The post “Shadow Blaster” Galaxy Might Have Sent High-Energy Neutrino to Earth appeared first on Sky & Telescope.

From high-speed battering rams to gravity tractors, the technology exists to protect the planet. The question is whether humanity will act in time—and in concert.

The post How to Stop a Killer Asteroid appeared first on Nautilus.