July 31st, 2015
Full Moon
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…

Seth Jarvis

Cosmic Quiz: How fast are we going?

This week’s Cosmic Quiz winner is Greg McMurray, who asked: How fast is the Earth moving relative to everything else? Let’s break it down. The first motion of Earth that we’re all familiar with is rotation – the movement of…