Ronald McNair was one of the astronauts killed 25 years ago on Jan. 28, when the space shuttle Challenger exploded. As his brother recalls, McNair's life was all about exploring boundaries — and exceeding them.McNair was only the second African-American to visit space.
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.
A team of U.S. and European researchers using the Hubble Space Telescope have captured infrared images of a blurry object they believe to be the oldest galaxy ever seen by man.The object is thought to be 13.2 billion years old and was seen by the Hubble Ultra Deep Field instrument.
Our universe might be really, really big — but finite. Or it might be infinitely big.Both cases, says physicist Brian Greene, are possibilities, but if the latter is true, so is another posit: There are only so many ways matter can arrange itself within that infinite universe.
Back in 2007, as part of a crowd-sourced study program called Galaxy Zoo, a Dutch school teacher discovered a very odd celestial object: It looked like a great, green blob floating in space and at the time it was inexplicable.Today, thanks to the Hubble telescope, we have an unbelievable picture of