January 21st, 2017
Waning Crescent Moon
Nick Jarvis

Night Vision: Human Spaceflight

Imagine the state of the world, and the state of science, in 1640. Galileo Galilei was in his last years, blind, and under house arrest for his view of the solar system, and Isaac Newton had not yet been born. But…

Seth Jarvis

Cosmic Quiz: Why can’t light escape a Black Hole?

This week’s Cosmic Quiz question comes from James Sylvester, who asks, “If the speed of light is the highest attainable speed, why can’t it escape a black hole?” First, a few words about the speed of light, which is indeed…