Joe Palca

NASA is building a new space telescope with astounding capabilities. The James Webb Space Telescope, scheduled for launch in 2018, will replace the aging Hubble Space Telescope and will provide unprecedented views of the first galaxies to form in the early universe. It might even offer the first clear glimpse of an Earth-like planet orbiting a distant star.

Hot tea on a hot day? Not for me, thank you. Not my idea of how to cool down.

Twenty-five years ago, an event occurred that is seared into the memory of most Americans: About a minute after liftoff, the space shuttle Challenger blew apart, killing all aboard, including teacher-astronaut Christa McAuliffe.

The day started off innocently enough. It was unusually cold in Florida that day, but NASA managers decided to attempt a launch anyway. As a subsequent investigation made clear, the cold temperature made O-rings, which were intended to contain hot gases, fail on the solid rocket boosters.